Reading through the 1,000+ entries was incredibly fun -- but was filled with enough great ones that it made it very difficult to pick just one overall.
I hope everyone enjoyed reading the captions as much as I did. Based on the huge number of entries and votes cast, I think it's something we'll try again someday.
A huge thank you to everyone who submitted -- you all deserve the official "Sheldon High-Five For Extraordinary Valor Among Exceptional Awesomeness".