Loud sneezes that are so far from a genuine sneeze. A Wah-Hooooooooo is NOT a sneeze.
DP walking round the house persistently clicking his fingers/clicking a pen top/gnawing his nails down to the elbow.
Actually, DP sometimes.
People who walk in front of me and then stop dead. For no reason.
People who walk so close up behind me that they're virtually wearing my knickers and who then protest if you decide to turn left and go into a shop as they then walk into you.
People in supermarkets who walk up to the conveyor where my stuff is, I put the divider on, and they then push the divider forward moving my food just so they can squeeze all their shopping on at once. It actually does move on... 
My dentist's receptionist calling me by my full name. I registered under (abbreviated, much preferred version) and she asked if it was short for anything, so I said, yes, "it's short for eenymeenymineymo* but please call me eeny" and so she without fail only calls me eenymeenymineymo.
If she can't call me eeny, then lets be more formal and go with Mrs Revenge rather than my full name! I've had a lot of dental treatment this last couple of months and more to come (recommend never eating toffees) and it's really getting on my nerves! How difficult is it?
*name isn't actually that, btw 