I was a supply teacher when planking happened. I'm a hearing impaired person but not completely deaf, I can hear most noises. I was teaching a class around 13/14, writing their work on the board, turned round and they were planking all over the classroom. desks, windowsills, cupboards, one of them was on top of the metal lockers like 6 foot high.

It's still the best thing that ever happened while I was teaching. I couldn't get it together for ages. No professionalism left at all. No idea how they managed to do it so quietly.