From Yahoo Sports:
When Matt Grevers jumped into the pool prior to this last weekend's 100-meter backstroke at the Missouri Grand Prix, he had diamond on his mind, not gold.
The two-time gold medalist had concocted an elaborate plan to propose to his longtime girlfriend, fellow national-team swimmer Annie Chandler, atop the medal stand. All he had to do was get there.
Grevers ended up winning the race. And when organizers asked Chandler to present the medals to the three top finishers, she didn't suspect anything out of the ordinary. When Grevers dropped to a knee, Chandler's reaction says it all