Richard Elfman? (I just watched Forbidden Zone; Danny Elfman isn't one, which makes it curious that he played Satan)
Eddie Deezen, the nerd from WarGames?
Giovanni Ribisi, an actor I've never liked.
Michael Pena? (agggh)
Frank Stallone, LOL.
Edgar Winter!!! Screw that.
Van Morrison thanked Hubbard in the liner notes of his 1983 album, but that's dabbling.
J. D. SALINGER?!?!?!? Augugugghghhhh!!!!
JEFFREY TAMBOR?!?!?!? Oh, wait, no, he left.