Is the touch pad really sensitive and when you're typing furiously, you're brushing the touch pad with your manly palms and it's registering as a click?
Yeah, what alex said, i do it on mine occasionally, I'll be typing away when suddenly the text starts in the middle of something i already typed, took me ages to realise it was me touching the pad with my wrist as i was typing.
99% of computer problems are user errors