I get the feeling that it's more satisfying when it's on your own keyboard, but it's definitely annoying on another person's.

I'll bet he can't even hear it.

It's like playing a video game, I'd imagine. The sound effects are the bane of everyone's existence but your own. Seriously though, you don't play your _game boy_ in public without headphones; let alone present while playing one! I'm amazed -- so, so tempted to turn of the preso even if I was fascinated by the content.

He turns it on at the beginning and says it's because he likes having audio feedback.