I really like my own, the whole room will turn and look at me like I might be about to go all axe-murderer on them (the trick to really making it evil is apparently to mix it in with genuine laughter, it adds this deranged flair to it that really creeps people out). I also like the one from Thriller, because every time I hear it I know I have to dance/attack someone. Dr. Evil doesn't sound very evil, but it's always funny when he laughs, so I suppose I've got to add him in.