18) Active Diarrhea
This sign loudly proclaims that no one with active diarrhea is allowed in the pool. This makes a lot of sense, but it still doesn’t negate the fact that these kinds of signs make our stomachs churn with nausea. We’re not sure we’d get into this pool knowing that there was previously a problem of people with diarrhea swimming in the water (via Bored Panda).