This might gross you out, but when we were little kids my brother and I picked up pinworms. Off to Mayo where they had us drink Epsom Salt--the magnesium really caused a clean-out poop--and then they were able to analyze the poop for eggs, which they found. Then he and I had to chew wintergreen-flavored pills for a couple of weeks at least. It was a long time before I was willing to eat that flavor again.