You know what would be really cool - some sort of gun like the ones that they use in supermarkets to tag merchandise, only with a lot bigger stickers. The problem with stickers is you have to peel the backing before you can use them, and you're already going to be all frazzled and shaken by the incedent, then you have to catch them. A piece of paper can be dropped in an open window easily, but a sticker is way harder. And open window is pretty rare around here, too - it's always either too hot or to cold for them.