Ahahah.. Never tried that but man it looks like a blast!
One thing I have done is this,
one of the shops I used to work in we had a big 10 or 15 ton Bridge Crane. I used to scare the crap out of people late at night (there was a stigma that the shop was haunted) I would rig a chair to one of the blocks and suck myself up into the crane where you couldnt see me unless you were really looking. Late night hotshot driver (who I would be waiting on) would show up and magically the crane would start to move. they go looking around for someone and never see anyone "controlling" the crane" Used to scare the crap out of people. Had 2 Drive off and had to call them back