Hmm, i dont even know where to start, the first one would be stains i cant get rid of, doesn't sound like much but let me paint a picture.

Imagine you're on a plane, you got a window seat, lucky right, but then you notice a stain on the window, you try to clean it, only to find out its on the other side of the window, so you spend several hours staring at it, and its driving you crazy cause you can't do anything about it. For me, that is hell!

Oh, and people who dont get sarcasm, so annoying
Friend: are you walking home?
Me: no, I'm gonna book a flight
Friend: but your house is just down the street
Me: exactly Tom, exactly!!