Even if you're a genius -- mother still knows best.

“As a psychiatrist, I know how important people's superstitions can be to them.”

Some of the best moments of Sheldon's bible thumping mother (played by Laurie Metcalf).

Sometimes the side characters stole the show on "The Big Bang Theory." For this list, we’ll be looking at times the long-running sitcom’s supporting cast gave us main character energy. Our countdown includes Zack & the Science Dudes, Beverly Hofstadte...