I used to do one a little bit simlier to this we used to tie fishing wire to a wallet and then drop it near a shop then hide behind something and than as someone went to pick it up you then pull the wire and they used to chase it. And another one was tieing fishing wire to peoples door knockers and then hide behind there wall pull and it would knock on the door and just keep on doing it then watching them thinking they were going insane was funny. Craig