all kinds! Thinking of a good example: An ally with a vending machine at the end and a conveyor belt as the floor of the alley. If you try to smash or damage the machine the conveyor belt will prevent you from walking away.
If they some how run to fast or if someone comes to help them with a rope sudden stops and reversal should make the adventure more adventurous.
The goal is to convince the test subject it isn't worth damaging the machine. People like that have a hard time remembering what not to do.
I'm not a sadist, the machine will feed them however long they are stuck there.