In which a person trying to retire for the night finds his or her bed impossible to enter. (This experiment is better known to summer campers as "short-sheeting a bed.")

Materials: A bed with sheets

Procedure:

1. Remove all stuffed animals, pillows, covers, and the top sheet from the bed. Leave the fitted sheet (the one with the stretchy corners that covers the whole mattress)
2. Lay the top sheet back on the bed. Normally, you would tuck in the bottom edge of the sheet under the mattress. Instead, tuck the top edge of the sheet under the top of the mattress.
3. Grasp the two bottom corners of the sheet and fold them
   upward, stopping about one foot below the top of the mattress. Tuck in the sides of the sheet. Now you've created a short pocket into which your target will climb.
4. Replace all covers, pillows, etc. exactly as they were before. Wait for results.

Questions:

• Rate your target's reaction on a scale of 1 to 10, where 1 is "amused," 5 is "not amused" and 10 is "enraged and/or throwing pillows."
• Siblings sometimes make better targets than parents, because they become at least as upset but can't ground you. On the other hand, siblings are more likely to retaliate.