This is a video from Smarter Every Day showing how you can get leafcutter ants to carry little signs for you by peeing on them. The urine, which contains salt, make the little bits of paper desirable for the ants to drag back to their colony and use to grow their fungal food. It reminded me of how you can get my roommate to drink urine by mixing it into the orange juice container.
Hit the jump for the video.
Thanks to Lukas, who tried to get cockroaches to carry signs by reasoning with them but they just infested his kitchen and set up base behind the refrigerator instead.