Sketched a dead rat on a piece of cardboard. Carefully cut it out and placed it in the recessed light fixture of the personnel managers office. 3 times!! :-)
While working in an aircraft repair facility, A&P mechanics worship their tools and tool chest. One particularly unfriendly and very possesive mechanic was on his 2 week vacation when we strung up his tool chest and hoisted it 110 feet above the hanger into the rafters. Upon his return, and 3 hours into his search for his now "stolen" tool box, we all point "UP". :-)
12, 16 inch plastic wire ties (the kind the cops use for cheap handcuffs) wraped around a supervisors driveshaft of his 4x4 pickup makes for the NOISIEST drive home you ever heard!!! :-)
We lifted the supervisors kissass assistant's Toyota Rav4 up with a forklift and placed a cutout watermellon half under each tire and lowered it back down. He couldn't move until his tires finally wore through an inch and a hallf of watermellon rhine. he just sat there in 4wd for a half hour not moving but tires spinning!! :-)
There's more!!! :-)
I've heard of taking one of those carbide rod blades for a hacksaw, a screen door spring and some baling wire and rigging the blade in a loop around the driveshaft, and tensioned by the spring. They say you get about 2 blocks before it saws the driveshaft in two.
The nastiest practical joke I've ever heard of involved taking cans of Great Stuff foam sealant and freezing the cans in liquid nitrogen. Then the cans are cut off with tinsnips and welder's gloves, and the slugs of frozen foam pulled out, and stuffed under the dash in a car. Roll up the windows, lock the doors and wait for it to thaw out.
That reminded me of my 11th grade english teacher. She drove a Fiat 850 convertible. Four of us picked it up and found it fit perfectly between the two flagpoles in front of the school. heh heh