“Why, no, of course I don’t think you’re crazy, too! And the fact that you just head-butted me outta nowhere for no reason hasn’t changed my mind at all!”
And apparently — in case you were wondering — the sound Superman’s head makes when smacked with a super-strong forehead is much like that of a small child trying to say “Clock.”
(From Action Comics #499, July 1985. Written by Cary Bates. Art by Curt Swan and Vince Colletta.)