The fun ones were when the students doing circuits sessions 1-5 in a 152 would choose their own adventure and retract ALL the flap 50ft above the ground in 40dg temps and only go to 3/4 power with the death grip on the throttle.. So much for the pre- flight brief and demonstration you think as your sphincter clenches tight..
Teaches you about the beauty of airspeed in a real hurry...