@ MikeyMike
That reminds me of school chemistry lessons - blow down the bunsen tap to put everyone's burner's out, sabotage other people's experiments by dropping sweets, pain killers, indigestion tablets in the beaker when they weren't looking - or my personal favourite:
there would be four rows of benches in the labs, each with three sinks sunk (unsurprisingly) into them. At the end of each row you could turn off the supply. So, turn the supply off, turn all the taps on - when the teacher's back's turned, or when people are standing around at the start of the lesson - turn the master tap back on....fat soaking!!!!
