Charlie Sheen

 Charlie Sheen (born Carlos Irwin Estevez', September 3, 1965) is an American actor, best known for his role as Charlie Harper in the sitcom Two and a Half Men'', a comedy also produced by creator Chuck Lorre.

In The Big Bang Theory
Sheen had a cameo appearance on The Big Bang Theory episode The Griffin Equivalency, where Raj had a quick word with him in at a restaurant.

Video
thumb|350px|left|Charlie Sheen's cameo appearance on the show