Mine is on Friday because as a student, I get dragged out to pubs, bars, clubs etc completely unwillingly! So I'll end up having a cheeky drink and something from the chippy, all in moderation of course. So I just weigh in before the disasters happen.
But it seems to be working cos I'm still losing. Perhaps if I didn't I'd be losing more but oh well, life gets in the way doesn't it.