The ultimate answer to any statement, showing that you think that what's been said is a load of bollocks, or at least that the other person doesn't deserve a reply that takes any of your valuable brainpower. If the other person is playing along, they should come back with a perfectly-weighted "Well..." with accompanying gestures.
"Britney Spears' latest album is the greatest piece of music of our age."
"Is it though?"
Harry: That’s kinda cool.
Vikk: To be fair though..
JJ & Tobi: To be fair though what? Vikk?
Vikk: Did I? I thought it was Harry that said that.
JJ: Vikk, Vikk, you literally said ‘to be fair though’
Vikk: oh wait, wait, I was agreeing with Harry.