Famous movie scream (not the wilhelm)
 

It was used in one of the Beethoven movies and Baby's Day Out. I think it was also used at the beginning of the cartoon, Ahhh! Real Monsters. This sound effect is hilarious and has been used in so many movies. It is really loud and long and it is a guy. If someone could point me in the direction of this sound file, I would really appreciate it.

Is it the Goofy one from Disney cartoons?

I know the one your thinking of and no, it is not it.