i just always choke, twice I've had it where I was just carroll was out and koston was at S.K.A.T. and then I screw bail or do a repeated trick by accident (I think I went for the 540 but only did the 360, dammit), and then koston throws a 360 lazer flip at me and I'm fucked. That challenge sucks balls.
I found the Rob Drydek challenges to be the most fun