Perhaps evoked best by the late and ridiculously talented Heath Ledger, the Joker is undeniably the foundation of everything villainous. Whether it's his bone chilling cackle or whimsically terrifying look in his eyes, he has made nothing less but the ultimate statement for villains all over.
As a villain, you would be dark, utterly insane, and so scary that people laugh at you instead of screaming. You've made some haunting decisions on this journey, but you're probably laughing already, aren't you?
If I smell even the slightest bit of laughing gas I'm coming after you, so don't you even dare!