Johnny Depp is a mad clown

hee hee (real chuckle)

And then there's the Mad Hatter, a role so befitting Johnny Depp (working with Burton for the seventh time) that it might seem too obvious for him. There is a trace of the been-there-done-that to Depp's somewhat rootless performance, but wishing for him to cut back on playing mad clowns would be like telling Fred Astaire to quit all that dancing.

http://news.yahoo.com/s/ap/us_film_review_alice_in_wonderland