I remember when we did that thing at school where you whack electricity through water and produce hydrogen and oxygen (is it electrolysis?), using a piece of kit with two glass tubes. I thought it was brilliant so when I got home I wired a short piece of flex up to a plug, bared both ends of the wires, covered them with tin foil and stuck them in a pyrex bowl full of water. I was so chuffed with the little bubbles coming from the ends of the flex and was trying to figure out how to collect the hydrogen so that I could make a bang like the physics teacher had. I heard Mum coming in and the eleven year old boy instinct that I was on course for a bollocking kicked in so I switched off. God knows what would have happened if I'd carried on - fried Trev maybe. And the circuits didn't fuse either.