A better question would be; why not?
From the results it looks as though everyone is fairly 'normal'. Just so you don't think that everyone is the same I can exclusively reveal that Danny Cattell routinely goes several days (up to 5) between expulsions. Lifestyles of the rich and famous eh?
We had a year-wide poll in sixth form on a related point - do you wipe your arse standing or sitting? One or other will seem so ridiculous as to be unbelievable, but trust me a lot of people do it that way. I seem to remember it being 50-50.
Oh yeah. Standing. Should we have a poll?