Also at my old apartment we had this starcase and it had a railing that was just far enough off the wall for me to slide down it - but at the very bottom of the rail it would turn upwards just a bit - it would shoot me up into the air and I would kick my legs and flap my arms around until I would hit the wall and then fall onto the ground. That one really does hurt tho so I only did it like 3 times. lol