I pulled a nice little prank on the people in the house I live in:
Patched an official-looking poster on the front door, saying:
This door will be closed due to repair, so please enter and leave the house via the backyard of the house next door, there is a doorway in the shed behind the house.
Of course this shed is packed with old toilets and other trash, and there sure is no door, but that noone of those stoner knows, they can hardly find the door to the cellars sometimes ^^
I live in the 1st floor, so i can sit here and snigger while they stand there, looking very hard for that secret passageway.
First guy already tried to climb in the shed, when I yelled at him to tell me what day it is
It took him a minute to get it :1orglaugh