In caving, rocking someone's pack is a pretty common gag. When they leave their pack unattended, you find as big of a rock as you think won't be immediately noticed and stash it in the bottom of their pack. Then you watch to see how long they carry around an overweight pack before they discover the rock. A buddy of mine carried a good sized rock through a cave for hours, on the hike back to the vehicles, on the hike to another cave the next day, all through that cave, and back to the vehicles before dumping out his pack and finding it.
Do tree climbers do this sort of thing?
Do tree climbers do this sort of thing?










