Enraged Jamie Foxx has threatened to physically harm former Seinfeld star Michael Richards if the pair ever meet after the comedian stunned America with a racist rant during a recent stand-up show.

The actor who played Kramer in the hit TV series Seinfeld stunned a comedy club audience when he allegedly launched a tirade of racial slurs at hecklers during a stand-up routine.

Comedian Chris Rock left pop couple Jessica Simpson and Nick Lachey red-faced when he blasted them for kissing during his act.