When doing training I would wait until the victim did a little bit of a "Hotdog" takeoff and jam the pedal. The results were a good lesson. I am refering to recurrent training and not flying with lowtime students.
Doing circuits for autos was the prime time because after 3 or 4 full ons the guy was having fun and wanted to get back upstairs in a hurry. Also by this time we were usually light on fuel with lots of power available.
Did some training with Bell and they had a very good method of recovery.