There are certain things you shouldn’t need to be warned about before using the bathroom in an airport. For instance, Sam Elliott’s character in Road House says the bar he’s working at ‘has a sign hanging over the urinal that says, “don’t eat the big white mint.”‘
Another thing you shouldn’t need a warning about is not to use the shower as a toilet, or one warning you about someone reaching out and grabbing you in that most sensitive of moments.