…wait until a co-worker takes off his or her boots today, and settles down for a long, soothing siesta. Then:
1. Stealthily retrieve said boots and remove the insoles.
2. Liberally coat the insoles with KY jelly.
3. Place the insoles (in a plastic bag) in the station freezer for a few hours.
4. Just as stealthily, replace the insoles and put the boots back in place.
5. Sit back and wait for the hilarity.