Originally Posted by Peckish

Okay, here's one of my "off-color" pranks...placed a "battery-operated marital aid" inside the storage compartment of someone else's sewing machine, turned it on, and slipped back out. When we all filed back to our machines, we heard the buzzing! The owner of the machine took it out and apparently had no idea what it was - the rest of us were on the floor, howling.