I was in the natgas pit, we had a guy that worked for us that was an artist as well, he could sculpt anything. One day he took some order tickets, glue, string and a rubber band and made what looked exactly like the back half of a gerbal, feet tail and all. We put some tape on it and stuck it to the back of a local's, (NECK), trading jacket, right where his ass was. It looked like he had a gerbal stuck in his ass!! Everyone was crying tears they were laughing so hard!!! He was looking around and chuckling too, trying to figure out what everyone was laughing at. He sat down on the top ring of the pit and we all started making squealing noises, then he started reaching around on his back, looking for a sign, which made us laugh even harder! We finally told him.
We weren't through yet. We called a clerk from heating oil over (other side of the exchange floor) and put it on his ass. On his way back, you could audibly hear where he was on the floor by the traveling laughter; options, crude, cracks and finally products.
I am laughing at the memory as I type this, likely one of the funniest things I saw down there. I could write a book just on the things we did for fun down there, always a good time.