A partial list:
Chelsea Handler (who inspired me to post this list)
Dane Cook
Carlos Mencia
Nancy Grace
Chris Berman
Milo Hamilton (if you haven't listened to an Astro broadcast, imagine a cross between Grandpa Simpson and Futurama's Professor Farnsworth doing radio play-by-play)
Tyler Perry
Jay Leno
Stephen A. Smith
Jim Carrey (even on "In Living Color", I didn't like him)