Apparently he gets some sort of kick out of squeezing BB pellets and things like that into his urinary tract and then taking them back out later on. It doesn't strike me as a particularly good idea, and sometimes he forgets, and they end up sitting in the toilet for a while.
I'm pretty sure it's hard on the pipes to the home, and I'd imagine there are some health issues that could be a problem.
All the internet connections I normally use have filters of some kind, so it's tough to get good information about the risks for these kinds of behaviors, but if there are any, I'd like to be able to warn my roommate before something horrible happens to him.
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