There was a moment when Jason Alexander realized that his character on Seinfeld, George Costanza, was actually a stand-in for Larry David, and that's when he got deep into the character. George Costanza is one of the funniest TV characters ever. He's the perfect archetype of an insecure man who has a preposterous amount of confidence at all the wrong times. Deceitful, petty, and self-hating, if you knew George in real life, you might go the way of his many girlfriends and dump him after only a few days of getting to know him.