Catch Me if You Can/Proclamation of Emaciation

"Seems so hard" and "Mr. Goodbar" make sense because Mr. Goodbar is a candy bar with peanuts in it, thus being hard to chew.

I always thought it was

Oh, Sam-I-am I can't go to sleep without an Ambien [I] Seem so hard, they call me "Mr. Goodbar" Saying catch me if you can