I am in the midst of a practical joke war with my neighbours and I need some help on coming up with something clever. I live in a sixth floor flat with my girlfriend, and we are good friends with a couple who live opposite us. We have an indoor car park, and every morning my girlfriend would walk past his car on the way to hers, and flick his windscreen wipers up as a little running joke. Every evening my neighbour would get home from work and eventually notice his car, and flick our cars wipers up in return. This was all fine and dandy, until last week sometime, we recieved an ominous text message - 'we have upped the stakes, 1 - 0 to us'. My girlfriend went to check the car and they had ripped pages from a copy of FRONT (UK "men's" magazine, google it if you don't get the subtle hint as to the content) and taped them to her car. In retaliation, we decided to cover their entire front door in heart-shaped post it notes. A semi-weak comeback I know, but we were under pressure to come up with something at short notice. We didn't hear anything for a week, in which time we have been over for dinner, out to the cinema etc. as a group, and so I had sort of assumed that this was over, until last night. Our neighbours knocked at our door and asked if we needed anything as they were going to the local 24 hour garage. My girlfriend asked if they could pick up some tin-foil, and they went on their way. Half an hour later, she got a text message saying 'we had to run straight out, left the tinfoil under your car'. She went down to the car park to discover that they had covered our entire car with tin foil and duck tape, complete with racing stripes and 2 - 1 written on the windscreen. We need to come up with something to retaliate. Nothing nasty or disgusting, I want them to laugh, but I also want it to be mildly irritating and as original as possible, I don't want to do something that they have already thought of. So I put it to you, MacRumorers, all suggestions will be greatly appreciated.