Anal spasm
From Toadwater Guide
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Each time you visit an outhouse containing a magazine, you run the risk of having an anal spasm. The odds of having one of these nasty afflictions is dependent on the number of times that you have pooped within the last hour. The more you poop, the more likely you are to have an anal spasm. When you have a spasm, you are unable to enter an outhouse for the time specified. This time is dependent on the amount you have pooped in the last hour.