My daughter needs to sign on here. She worked for a colon/rectal surgeon when she was in college. Besides the things already mentioned here and in Skunys thread, she saw xrays revealing brooms, lightbulbs, (not such a great idea after all) telephone receivers, kitchen utensils, tool handles.. etc.
What I found amazing was the story that it was always an "accident". Someone was running and the next thing they knew this object was there. That being said, I don't have an opinion on what people find enjoying. But I take care when running in my house now.