sugar in the petrol tank... best way to silently kill an engine, and by kill I mean, for good.
When I was real little I had seen or heard about people putting sugar in petrol tanks but I didn't quite get it or know why.. so I thought I'd try it and find out, not as a prank, just because I was a curious kid.. heh.. My parents had inherited this old VW kombi van, so it wasn't a main mode of transport or anything, but I poured some lemonade into the petrol tank - didn't seem to do anything. So then I tried the sugar thing and again, no effect. We had that thing for years more and it just kept ticking. Those germans know how to make machinery.
if any of them are smokers a good thing to do (which happened to me) is to prick their smokes with a pin through every one of them and see how long it takes before they realise why its so hard to take a drag
Heh, a smoking related prank we did to a mate once (I'm sure it was pay back for something but can't remember) was that we got one of his ciggies when he wasn't in the room and another mate dropped his dacks and stuck it between his butt cheeks as if his bum was taking a drag, and we got a photo of it. Then put the cigarette back in the pack and left it. We were all getting pissed and of course that mate was smoking like a chimney, so we waited til he went through the whole pack and then lost it laughing. At which point we showed him the photo and then the other jokes started.. "Hey heff, can I BUM a smoke?"
We also took a photo of him smoking the last one and later on I made an animation which morphed between him having a drag and the photo of the smoke between the cheeks.. hahah.. naturally he was pretty dark.
His attempt at revenge was when we were at the pub once, one of the other mates involved went to the toilet and he flopped his dick out and dipped it in the other mates beer. I covertly let the other mate know though, so he didn't end up drinking it - that was just so I knew he'd have my back as well.