We want to know: Vote for your most memorable Summer Olympic moments

Michael Phelps, Mary Lou Retton, Sugar Ray Leonard (Getty Images/AP)What are the most memorable moments in the history of the Summer Olympics? Yahoo! Sports wants your opinion. From now until the start of the 2012 Games in London, we are rolling out 20 of the most memorable moments the Summer Olympics have ever produced. Now it's up to you decide which are the most memorable:

Michael Phelps wins eight gold medals (Beijing 2008)

Phelps laid out a program that on paper looked nearly impossible: eight swimming events in nine days. By winning eight gold medals, Phelps became the most decorated athlete at a single Olympic Games. And more than one of his races came down to the last possible instant. Just ask Milorad Cavic.

Kerri Strug vaults with injured ankle (Atlanta 1996)

Believing the U.S. needed her vault to clinch the team gold, Strug limped to the runway on a left ankle she'd injured moments earlier. Running with one good ankle, she completed the vault, stood on one leg, then fell to the ground. Turns out the U.S. didn't need Strug's score, but we all remember the effort much more than the particulars of the score.

Muhammad Ali lights cauldron (Atlanta 1996)

Muhammad Ali (Getty Images)It's always a mystery: Who will light the Olympic cauldron? On July 19, 1996, Janet Evans made the final pass of the flame to a man that will never need an introduction. With his left hand shaking from the effects of Parkinson's disease, Muhammad Ali clutched the torch with his right hand, raised it, then lit a flame that slowly made its way to ignite the cauldron. Unforgettable.

The Dream Team (Barcelona 1992)

For the first time, NBA players were allowed into the Olympic Games. The result: The Dream Team, a roster that included 11 eventual Hall of Famers and a team whose closest game was a 32-point blowout.

Carl Lewis wins four golds (Los Angeles 1984)

Lewis entered the 1984 Games with one thing in mind: becoming the second person ever to win four track and field golds in a single Olympics. Jesse Owens did it in 1938; Lewis matched him 48 years later.

Nadia Comăneci scored perfect 10s (Montreal 1976)

No gymnast had ever earned a perfect score of 10 until Comăneci turned in a performance on the uneven bars at the 1976 Games that left judges with no choice. Comăneci would earn six more perfect scores and the gold medal.

Bruce Jenner wins the decathlon (Montreal 1976)

Jenner dedicated four years to winning gold in the decathlon in Montreal. The work paid off. Not only did he earn the title as the world's greatest athlete, but he parlayed his two-day performance into a lifetime of celebrity that eventually landed him a seat at the head of the Kardashian's dinner table.

Sugar Ray Leonard leads dominating U.S. boxing performance (Montreal 1976) 

Sugar Ray Leonard launched his Hall of Fame boxing career with a spectacular performance at the 1976 Games in Montreal. En route to winning one of five golds for the Americans, Leonard marched through the '76 Olympic tournament, winning each fight 5-0.

USA-Russia basketball controversial final (Munich 1972)

Since basketball became an Olympic sport in 1936, the USA hadn't lost – until the '72 final against Russia, a game that remains steeped in controversy to this day. Forty years later, members of the U.S. team have still not accepted their silver medals, contending they were cheated out of gold.

Israeli athletes killed by Palestinians (Munich 1972)

On Sept. 5, 1972, a Palestinian terrorist group took members of the Israeli Olympic team hostage in an apartment in the Olympic village. The terrorist group, known as Black September, called for the release of prisoners held in Israeli and German jails. The standoff lasted 21 hours and ended with the death of 11 Israeli athletes and coaches and one German police officer.

Tommie Smith/John Carlos medal stand protest (Mexico City 1968)

Tommie Smith (center) and John Carlos (AP)In arguably the most iconic image ever produced from an Olympic Games, Americans Tommie Smith and John Carlos thrust their black-gloved fists in the air while standing on the medal podium after having won gold and bronze, respectively, in the 200-meter dash. The purpose of the salute was to represent black unity and power during the civil rights movement in America.

Jesse Owens wins four golds in front of Hitler (Berlin 1936)

It was a moment when sport and politics collided on the world stage – the great American athlete, who happened to be black, performing in front of a man trying to lead a resurgence of Nazi Germany where the superiority of an Arian race was propagandized. Jesse Owens sprinted through Hitler's house and won.

Usain Bolt shatters world records in 100m and 200m (Beijing 2008)

The sprinter with the name to fit ran into the record books, becoming the first since Carl Lewis in 1984 to win Olympic gold in the 100 and 200. In the process, Bolt established world records at both distances and sparked a curiosity as to how much faster he could really go.

The greatest Opening Ceremony show ever (Beijing 2008)

Lasting more than four hours and at a cost of around $100 million, the Opening Ceremony at the Beijing Games featured light shows, fireworks, dancing and some 15,000 participants. It ended with Li Ning, suspended in the air, "running" horizontally around the cornice of the stadium, where he eventually lit the Olympic cauldron.

Marion Jones wins five medals, then forfeits them all (Sydney 2000)

The darling of the 2000 Games after winning five medals, including three golds, Marion Jones became a symbol of all that was wrong in sport after it was revealed she used performance-enhancing drugs.

Michael Johnson's unprecedented double gold (Atlanta 1996)

Sporting a pair of custom-made gold Nikes, Johnson entered the '96 Games in Atlanta with a goal of becoming the first man to win the 200 and 400 meters in the same Olympics. He won the 400 by more than one second, then shattered his own world record by more than 0.3 to win the 200 and complete the unprecedented double.

Florence Griffith-Joyner's double world records (Seoul 1988)

How good was FloJo in 1988? The world records she set en route to winning gold in the 100 and 200 meters still stand today, 24 years later. In a sport where men tend to get most of the attention, FloJo grabbed the spotlight, becoming a role model for women wanting to compete in track and field.

Mary Lou Retton wins gymnastics gold (Los Angeles 1984)

Before 1984, no female gymnast outside of Eastern Europe had won all-around gold. Mary Lou Retton changed that with a perfect vault. And when she hit it and flashed that million-dollar smile, a star was born.

Mary Decker collides with Zola Budd (Los Angeles 1984)

The 3,000 meters played up to its billing as Mary Decker Slaney vs. barefooted Zola Budd. They were running 1-2 just past the halfway point when Budd appeared to step in front of Slaney, who stumbled, fell to the ground in a heap and lay on the infield in agony as the race went on without her. Who was at fault depended on who you were rooting for.

Mark Spitz wins seven golds (Munich 1972)

Michael Phelps' eight-gold medal effort in 2008 was fathomable only because of what Mark Spitz had done 36 years earlier, when he won seven at the '72 Games. It was a redemptive performance from Spitz, who'd predicted he'd win six in the '68 Mexico City Games and came away with two.

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