http://www.buzzfeed.com/laurenpaul/whats-your-favorite-george-costanza-moment-from-seinfeld

The Lord of the Idiots has provided so many.

George had so many great moments but his speech about saving the whale in "The Marine Biologist" was the first thing that popped into my head after reading the thread title, so I'll go with that.

I like when George got fired from a job and went back the next day and acted like he still worked there!!