Annoying sound

18. What kind of sounds are the most annoying?

Bang on my bedroom door. Some people just can't knock nicely and gently. They'd go to my room and went "bam bam" on the door. As if i was deaf! Ok i might be temporarily deaf when i'm listening to my headphone. However, when i'm asleep, i find it the most grating thing ever to be waken up by a loud bang! I can get serious headache afterwards because of the surprise wake up call....

People hammering their keyboards like they're furious or something....