Stock reference photos of "maniacal evil genius laughter."
Always a staple of comics.
(And yes, I am aware that most of these pictures are creepy. That's what makes them fun!)
This photo is creative commons, so anyone may use it for their projects, commercial or noncommercial. You don't have to ask permission or credit me or anything. It's cool.
(There's more emotion stock at my stock account: [link]