So yesterday, my coworkers set a box full of bottle caps in one of my cuble cabinets. When I opened the door, they all came raining out. It was all in good fun, they helped me pick them up, but... I want to get them back. Any ideas for safe and funny (emphasis on safe) booby traps to rig in their cubicles. I've searched online and only found how to rig a rat trap with a shotgun shell or hang fish hooks from trees... not the most appropriate, I think.
Acceptable payloads would be silly string or puffs of glitter, etc. Think Mentos+Coke bomb.
Rob