2x19 "The Dead Hooker Juxtaposition"

See how Kaley Cuoco, Jim Parsons and the rest of the cast of "The Big Bang Theory" have transformed since back in Season 1!

These "Big Bang Theory" Zitate never get old. For this list, we’ll be looking at quips from all 12 seasons that gave us the best laughs. Our countdown includes Howard's survival training, Sheldon can't let go, Bernie's fake laugh, and more!