As children we used to pinch Izal toilet paper from the school loos to use as tracing paper. Trouble was, it had a horrible carbolic smell.

My friends and I once laid Izal toilet paper under the keys of the music teacher's piano in our assembly hall. When he played the hymn for the whole school next morning, there was the most wonderful accompanying percussion, rather like a snare drum. He was livid, but we never let on.