What's one of the most annoying things that can happen to you?

This morning, i woke up at around 3am. I had this english test to finish off (i was around 1/3 of the way through) and i spent hours typing, checking, and making sure it was good to pass ... then i woke up at 8:25am and realised that didn't actually do it, i just dreamt i did it >.< i wondered why my printer was through here in the bedroom printing off comic strips ...