Printer Prank #9: You've Been Sharked!
(click to get full-sized version, then print)

Specimen: Print out this sheet. Then occasionally stop by the printer, and pick up any printouts that co-workers have not yet picked up. Put the "sharked" sheet back in the paper tray, and continue on your day. You'll know the prank has worked when you either see or hear someone discovering their work has been "sharked." Their nuisance = your laughs. (Contributed by ZUG reader blandysnorhal.)

Expected lifespan next to printer: As long as you keep it going.