Off: like really upset, hard to explain, it's just, well, because you hate it.
A few of mine:
My clean clothes being squished into a laundry basket because someone needed the dryer.
Food left in the sink. Or worse, dirty napkins left on a dirty plate in the sink. YUCK.
No trash bag in the can.
I try not to let them get to me. But they're the type of things that just don't have an excuse or explanation in my mind. I just can't help it.