In case no-one has guessed at this theory in the last 14 pages (buggered if I'm combing through them to check) I suspect Yahtzee actually recorded the video, then realised he'd been speaking too fast to actually be understood easily (I noticed during his MW2 review he was speaking markedly faster than before) so he manually slowed it down to make it easier to understand, which caused his voice to distort and pitch to drop. Well that's my theory and I'm sticking to it.
"Clever girl." HAH! That was hilarious!
"Clever girl." HAH! That was hilarious!