I say 16.
No I say 31.
You're wrong, it's 16.
With all due respect, idiot, its 31.
Ha! You think you know everything. It's 16!!
Yes I do, and its definitely 31.
You're a fool. 16.
Dummy. 31.
16
31
16
31
And on it goes.
Reminds me of "If you want arguments, they're down the hall".
Personally, I think it's... ummm 2 x 15-1/2
