What's the difference between obsequious behaviour towards someone important in order to gain advantage and John Wayne Gacy wearing a top hat and monocle?

What's the difference between obsequious behaviour towards someone important in order to gain advantage and John Wayne Gacy wearing a top hat and monocle?

One is sycophancy and the other is a fancy sicko.

(As far as I'm aware this is an original joke that I created and am quite pleased with)