BBS- He knows too much. It's like arguing with my dad.
saxitoxin- His wit gives him such a huge buffer it's not even fair.

Fruitcake- He's old as the hills and therefore to me rather intimidating in his wisdom. I think he may have known Jesus personally.
Andy- Everything just rolls off him, it's like fighting one of those inflatable punching bag things so you end up just looking like a stuttering prick.
I'm sure I'll remember more as time goes by.
So my question to you all is this: Who are your personal most worthy opponents and why?