Jumpers
My mate in his 1st year in uni lived in halls. This one evening 4 of them went for an some refreshment at the student union bar. After availing themselves of the inevitable cheap booze. One of the lads invited them back to his room to smoke some weed and listen to some tunes.
Once he got back there he plonked himself down in his comfy chair he had in there rolled an enormous spliff smoke the majority of it then passed out. This was apparently a common occurrence. He would be out cold for about 2 hours he would wake up after switching off and re-join the party. He was happy for people to roll with his gear and be in his room. Obviously he got drawn on. Things stacked on him he took it with good grace. It became clear that during these blackouts he was well and truly out for the count so they hatched a plan.
They lived in a high rise halls of residence. Every single room in these places are identical. His room was on the top floor. They had a room ready prepared stripped bare on the bottom floor. They waited till he passed out then took all his shit out an put it in the bare room. Set it up so it looked the same. Finally carefully moving sleeping beauty passed out in his chair down in the lift. Then all sat around carried on and waited for him to wake up.
When he did they carried on smoking as was the norm until they decided it was time to go to bed when they all left by jumping out of the window and going “Ahhhhhhhhhh” getting quieter.
When sleeping beauty eventually overcame the stoned shock of seeing 3 of his mates jump out of a high rise window he stumbled to the open window and was relieved and confused to see his mates alive well and pissing themselves laughing
(sittingduck Attention seeking, bullshitting fuck-knuckle, Tue 9 Apr 2013, 11:52, 4 replies)

I had something relatively similar to this, but I'll put it here as a reply for reasons that will become obvious:
I came home to my shared student house, went to my room, to find one of the posters upside-down.

I went downstairs to the stoners, and asked WTF?

"Oh yeah", they said, "We were going to move all of your stuff by an inch each day", but in the end we decided just to turn the poster upside-down."
( Je suis un vagabond is an unfunny, up your own arse middle class knob, Tue 9 Apr 2013, 14:52, closed)

In one houseshare, I was often last to go to bed.
Two or three times a week, I'd move all the posters, postcards, etc on the chimney breast up by just a tiny amount.
By the time we came to move out, they were all about a foot higher than their starting places.
No-one noticed and no-one believed me when I told them what I'd been doing.
That was a surprise.
( 4Q just lurking, Tue 9 Apr 2013, 22:53, closed)

Your housemate sounds like my housemate
We used to pile an unbelievable amount of shit on him when he passed out
( Major Turd for tonight only, Tue 9 Apr 2013, 21:01, closed)

College Japes, eh?
My late mate Andy and I once mirrored a girl's room at college. Everything identically opposite to where it should have been, bed, chairs, posters, even down to the contents of the wardrobe. Pathetic, really, but it amused us for about a week.
( The Lone Groover has mal des nuts., Wed 10 Apr 2013, 18:52, closed)