Fred Norris 

The remarkably talented sound effects genius behind The Howard Stern Show, Norris provides absolutely hilarious sound effects throughout the show's interview segments in lieu of actually verbalizing. Many times, Norris is not heard from for the entire show.
"The King of Mars" is easily the most enigmatic members of the show... his real name is Eric yet nobody knew.

"Hey buddy! How are you?"
"..."
"Are you still there?"
"..."
"Thanks for the input, Fred."

Fred Norris by Mister Skin August 23, 2005