HU NL200 against a guy who gives a new definition to the term "tilt"

[Go_Blue88]

My opponent is tilting more than anyone i've ever played. Prior to this hand he went all in four consecutive times, this being the fifth time. We had been playing for about thiry minutes when this hand came up:

I, ~600, sit in the bb with A6o. Villian, ~200, goes all in, hero??

I'm not sure how interesting a hand like this is to you all, but i guess i think it's a difficult situation. What would you do? Also, as a pre-emptive strike, i don't believe in the logic "wait for a better spot," i look at this as possibly the world's easiest 200 bucks.