I have a theory, that there is a terrific link between what is funny and what is scary. I think there is a very close connection between what frightens people and what makes them laugh. Laughter is a kind of nervousness. Animals don't laugh. Smiling is, anthropologists agree, directly linked to the baring of the teeth.

Jan Moir (March 11, 2002) "'You're not scared of me, are you?': Christopher Walken has cornered the market in movie menace. But, as Jan Moir discovers, he is just as unsettling in real life", The Daily Telegraph, p. 18.