Back in the ealy 1970's at Borough Green CP in Kent, the toilet block was separate from the main school, with lads and girls entering via doors at opposite ends. Inside the building was a partition wall to keep the boys and girls apart, but, inexplicably, it only reached to within a foot of the ceiling. This left a clear opportunity for scat-based mischief:
1) Help yourself to a lot - say 6 yards - of bog roll.
2) Fold it over a couple of times so that it forms a thick, 18 inch long strip.
3) Use your arse cheeks to hold it in place hanging above the water in the bowl as you drop off a steamy bob into the waiting dung 'hammock'.
4) Gather the two ends that have been sandwiched between your buttocks and the bog seat and, in a David and Goliath stylee, sling your cack grenade over the top of the partition wall and into the girls' side.
5) Listen for screaming and walk out, whistling and with your hands in your pockets.
Considering how crap at lying 6 year olds are it is a miracle I got away with it.

A firm stool, wrapped like a brown mummy in toilet paper and dipped briefly in water, can be cradled in the palm without inconvenience or tell-tale odour. But, as sex offenders in Wandsworth Prison and English boarding school pupils can testify, it detonates on impact when thrown, like a big bomb of shit.