Steve Harvey has encountered some wild contestants on "Family Feud" before, but on Friday's "Tonight Show," the craziness values were tripled. Harvey returned to the show to play another round of "Feud" with Jimmy Fallon and The Roots, and things got out of hand fast. From the start it was clear that none of the contestants had any idea what they were doing. Fallon was answering like he was on "Jeopardy," no one knew when to huddle up and The Roots even cheated.