Not a prank, but another reason to keep the door locked:
3 a.m. Blake comes back to the dorm after killing off half of his brain cells drinking. Again. Goes into the restroom, takes a left towards the urinal and takes a leak.
Only this is not the restroom. Blake has missed the door by one and has instead entered a dorm room. He is currently pissing on a papasan chair.
Roommate A, hearing the noise, wakes up, and at first thinks Roommate B is peeing in bed. No, that can’t be it. Looks down from the loft and sees Blake.
Roommate A: “OH MY GOD! BLAKE! STOP!”
Blake: “muuuuuuh?”
Roommate B: “OK. That’s it. From now on we lock the door.”
[Blake, hearing the words ‘lock the door’, locks the door]
Roommate A: “Blake! Turn on the light and unlock the door!”
Blake: “muuuuuh?”
Roommate A: “Blake… Turn on the light.”
[Blake turns on the light]
Roommate A: “Now unlock the door”
[Blake unlocks the door. He turns around and finally realizes what he has done. He finds a roll of paper towels and covers the chair cushion with a sheet in an attempt to remedy the situation.]
Roommate B: “Blake, get out of here”
[Blake somewhere in him finds some small level of coherence enough to speak]
Blake: “Now I admit, what I done is wrong… but YOU gotta admit that if you kept your door locked --”
Roommate B: “BLAKE GET OUT OF HERE BEFORE I KICK YOUR ASS!”
Names have been changed to protect the innocent. The guiilty get no such luxury.