Floured
Halls of residence, Liverpool JMU 1996.

Navy cadet type dude plays tricks on everyone, everyone gets bored of it and decides to play one on him.

Navy dude goes away, sensibly locking his bedroom door.

My mate gets a sheet of newspaper, a bottle of talc and a hairdryer. Slides newspaper half under door, empties talc onto the half on his side and uses the hairdryer to blow the talc under the door into the Navy dudes's room.

Navy dude returns to find his whole room and his expensive naval dress uniform lightly frosted with a thick layer of talc.

Length? He held a grudge for the rest of the year.
( DeSpong currently knitting your suggestions - see profile, Fri 14 Dec 2007, 7:58, 2 replies)

.
Same idea, safer/easier to conceal delivery method:

- Stick the talc into an old record sleeve

- Slip the open end under the door

- Squeeze the sides together to fill it with air

- Stamp on it

Also works well with shaving cream, or watercress seeds if you can give the carpet a good soaking first. Mmmmm, edible green carpet.
(misanthrope is so adjective he's verbing nouns!, Fri 14 Dec 2007, 10:03, closed)

That's still a military thing today Spong.
There were a couple of Air Tragic sgts here last year that did that to each other on a weekly basis. With the occasional result of our corridor getting talc all up and down it. Much to our, and the cleaners' amusement. Oh how we laughed when their superior found out and they got bollocked in front of us all before being shipped out to a punishment posting.
( stuj (^(^;;^)^) GO TEAM SPIDERS!(^(^;;^)^), Sat 15 Dec 2007, 2:00, closed)