The Big Bang Theory is, at its heart, about relationships. The geek culture references, cameos, and science speak are dressings, and funny ones at that. But from the very beginning, the series set ...

Sheldon Cooper (Jim Parsons) is the heart and soul of "The Big Bang Theory" — for worse or for better, depending on how you feel about the sometimes controversial, sometimes abrasive character.

Penny, played by Kaley Cuoco on "The Big Bang Theory," is pretty great ... except in these five particular moments.

To underscore those rare instances when he succumbs to his humorous side, Sheldon will punctuate his jokes and pranks with the triumphant exclamation “Bazinga!” after (sometimes long after) his jokes ...