... craters ...
I may try to get a pic later. The Boy's favoured chair (think Captain Kirk) is festooned with remote controls, Horrid Henry books and simliar shite. It stands with its back to one wall. He cannot enter the room and sit on the chair. Oh no. He runs at full tilt and performs an aerial forward summersault landing on the chair in a sitting position.
Repeated impacts over the years have in fact forced the chair into the wall causing lunar style craters in the plaster
These have to be repaired (prolly entire wall needs doing cos of other hairline fractures caused by said feat.)