For those who haven't watched it as adult please go watch the bad guys big introductory song. It's literally a goddamn sludge monster singing about how much destroying the environment turns him on. There's even an extended version where he uses the words a special kind of horny.
Did you know Tim Curry was the original choice for Judge Doom in Who Framed Roger Rabbit? The screen tests showed he was too scary and they went looking for another actor, eventually settling on Christopher Lloyd because the director had worked with him on BttF.
Robin Williams almost refused to do this film unless they let him have the batty rap. Part of it was he had just been shafted by Disney breaking contract terms and selling The Genie merch from Aladdin despite him being vehemently against it.