How much fun can you have with an IV bag taped to your side? Lots if you strike up a convo with the guy at the urinal next to you and tell him that you just had surgery on your dong, and then start to pee on him.
When I was in the hospital for lung surgery and all doped up on morphine and percocet, my older brother and I came up with a prank where I filled a plastic bed urinal with apple juice, and drank from it to get the nurse's reaction.