2012 Summer Olympics Best and Worst moments

The men's 4x100 medley relay -- from left, Brendan Hansen (Breast), Matt Grevers (Back), Michael Phelps (Fly) and Nathan Adrian (Free) -- helped Michael Phelps go out with a record 22 medals, 18 of which are gold. Greatest Olympian ever? Probably.

-- Andrea Reiher, Zap2it