Just like the TV programme - you are allowed one PET HATE to put into ROOM 101 where it will sink to the depths of nothingness never to be seen again (well, that's the theory).
I will start us all off with my personal PET HATE of bad drivers, particularly the kind who can't use roundabouts and just sit there letting every Tom, Dick and Harry past when we all know YOU ONLY GIVE WAY TO CARS ON THE RIGHT (unless you're not in England of course).
You might have guessed I was caught behind one on the way to work this morning.
So what's your PET HATE for ROOM 101??? Feel free to have a moan.