Mario Gets a Big Kick with Cast of 'The Big Bang Theory'

"Extra" host Mario Lopez visited Johnny Galecki, Jim Parsons and Kaley Cuoco on the set of their hit CBS series "The Big Bang Theory."

Watch the hilarity ensue!

Tune in to "Extra" on Thursday to watch more "Big Bang" set interviews! And if want to pick up a cool "Big Bang" T-shirt, click here!