My friends and I have an on going joke where we pass a traffic cone back and forth. If you have it, you have to leave it in a funny spot for a different friend to find.
It started with just putting it on each other scars, but we have become more creative. I've put it in my friends bed and a few weeks later there was a bottle floating in my pond. I pulled out the bottle and there was a rope attached to it, which pulled up the cone from the bottom of the pond.