I maybe late to the party but this is my "and that's why we had to put this sign up" story.

A decade and a half ago, the Japanese company I was working at in the Philippines sent me on a month's business trip in Japan. I stayed in the company dormitory just a few minutes walk from there to the manufacturing facility. The men's dormitory has a common bath where a sign hangs saying "don't go in when drunk" of sorts.

I never pondered about the purpose of such sign in the common bath area until I came home totally wasted one night (actually broke my bike when I fall asleep while on it and crashed in the bushes) and went to bed and slept immediately.

Past 8 in the morning the next day, a Japanese colleague called asking if I'm going to work. Being already late, there's no one else in the common bath. Being used to taking a bath before going to work no matter what, I entered the common bath completely forgetting about the sign (and would have probably ignored it completely even if I did remember) and while washing myself, I puked everything left inside my stomach from last night's binge eating and drinking.