It is bad to play mean pranks on people
Colm is living with a roommate and it is Halloween.
Colm wants to play a prank on his roommate.
Colm puts a fake spider on the table.
Colm sets up an elaborate murder scene with fake blood and actors that kidnap his roommate.
Colm's roommate finds the prank fun and harmless.
Colm's roommate becomes traumatized.