Select any Question he's comfortable with
1. and use "double points" for Top Answer. (every top user will get double points)
2. and use "set-to-zero points" power for those with answers below him. (ex. he answered the top answer, everything outside Top answer will get ZERO points.. if he answered a UNIQUE one, nobody will get ZERO Points aside from the invalid ones)
3. and use "negative points" power for every user who answered invalid/unique answers. (-5 points to be awarded)
Hmm let's see , which of these will make most of you flop harder