Playing HU against a maniac ?

[rodders133]

I am talking here about HU SnG rather than the final stage of a STT or MTT.
Every now and again when playing these, I will come across a player who from the start will go all in on every hand, pre flop. I dont know why they play the game if they are doing this but thats their business.

My question is what is the minimum starting hand you would call their all in with?