I know the difference. I also have a laptop with a keyboard that isn't exactly friendly or entirely predictable, and a mousepad thats downright schizophrenic to boot, although the mousepad is the worst. And a key missing (although not one relevant to the your/you're distinction) its just buggered off somewhere and now I make that character by poking the contact point with the mouthpiece of my e-cig, although it isn't an alphanumeric character and is only seldom used.