Our chemistry lab at school had wooden work tops that went around the outside edge linked together with a small gutter edge and gradual slope running downhill until the very last desk which also had a sink attached,.. idea being any liquid spills would eventaully run down into the sink.
One day I noticed my arch nemesis Jim Hopkins sitting at the last desk with his new walkman, pencil case and library books covering the gutter,.. so armed with lighter fluid and a bunsen burner I went about pouring the liquid into the trough until the tiny trickly reached its target.
WOFF!!!
Within a few seconds everybodys desk was on fire and I was in a hole world of trouble.
Not a good day for me.