Edit* Hamill seems to laugh until he cries which I love, but Ledger seems to cry while he laughs if you get me. Very disturbing. The "forced laughter" seems to be precisely what makes him so scary and real. I guess it begs the question what is "true" crazy. Or maybe it's just two types of crazy: the ability to completely change ones disposition from fury to genuine amusement and enjoyment in a heartbeat, or a kind of ever present anger hiding behind a happy laughing face. If I'm not mistaken, irony is a big part of the joker, and Ledger's laugh conveys the irony of a murderous clown. A quick google search of the word irony received this definition "the expression of one's meaning by using language that normally