Not housemates but still pretty rough
I've been very lucky and all the flats / houses I've shared have been a good laugh with little (or no) negative aspects. However, some of the room shares I've had to deal with (due to work) have been utterly vile.

One in particular sticks out, where an engineer arrived two days after me to aid in finishing a project - we get steaming drunk as soon as he arrives, head back to the digs, get some kip. He's also omitted to tell me he's just finished a course of medication which doesn't mix with drink.

Wake up circa 3am to the most horrendous retching and boking - flick on the light to see what the problem is and there's the other engineer spewing, Linda Blair stylee, all over the wall, the door, the floor, the wardrobe, him, his bed and everything else within range. Get him a bucket, gingerly clean the door-handle with a rag, make sure he's awake and not choking on his own puke, go back to bed.

One hour later I'm woken up by the sound of running water - groggy, still thinking I'm at home and the pipes have burst, sit bolt upright, to be greeted by the clear silhouette of someone pissing freely all over the foot of my bed. I slept on the sofa for the rest of the job. He didn't tell me he was a sleepwalker either.

An occaison also springs to mind of being quite literally trapped in a room, spewing and shitting into a bath until I thought I was going to die (food poisoning). Every time I smelt the offending food (by the only door out), or tried to move it I started off again, so on this occaison it was my hapless co-worker who got the raw deal.
(mymilkshakebringsallthemongstotheyard poison hearts, poison minds - joining hate, Thu 5 Apr 2007, 19:01, Reply)