I had a housemate who over the years I shared a home with him, I came to absolutely despise.
I started a blog so I could blog the stupid rows we had - and I could show my friends and snigger about it behind his back. He was such a prick, he got us a 'filthy and verminous' warning on our house because his room was THIGH DEEP in rubbish, there were two clear spots to put feet to get from door to bed and he would sit in a deckchair and play games all day, pissing in a two litre pop bottle rather than get up and go to the bathroom NEXT TO HIS ROOM.
There were MANY other crimes (one bath a week but it hed be in it for hours, in a home with only one bathroom, smoking a cigar, drinking Kahlua and eating burger king... all in the bath...)...
I once threw all his pants and socks onto the roof of our outhouse because he wouldn't take them off the airer and insisted I FOLD THEM FOR HIM and put them in his room (it was 3pm and he was still in bed).
I don't know how I didn't stab the filthy bastard, I came very close the day I came home from three weeks away dog sitting, (and i had taken my dogs with me so he had NOTHING to do at all.. but mind the house).. to find he had spent those three weeks wiping his arse on kitchen roll and had backed up the pipes all down the garden and up the foul drain to the toilet. We lived opposite a shop that sold 25p individual toilet rolls! Council had to come and fix it, it was disgusting.
He annoyed me SO much that every time I cooked I'd put mushrooms in it, whatever it was, I can hide mushrooms in it. He would wang on about how he was horribly allergic to mushrooms but I was certain he wasn't so I risked it... he wasn't, he ate it all up every single time.
Then sometimes to be a complete cunt, I'd make something I knew he really liked, but I wouldn't hide the mushrooms, Id say 'oh no sorry I put mushrooms in this one, maybe next time' and he wouldn't have any cos HE thought he was allergic HAHAHAHAHA.