I agree, that's gotta be the worst thing ever.
Things that annoy me are (they are just little things)
1. Untidy rooms
2. When people mess up my CD rack and rearange my CD's (they are in band order, damn it)
3. When people don't change the toilet roll after it's been used up
4. When people don't use toilet spray
5. Leaky pens
6. Unironed clothes
Those are little things that annoy me all the time