Doing laundry is one of the most boring things I do (aside from writing scripts for bad Sampung Sulyap movie reviews) so I tend to look around and observe details around the laundromat. I see a hole in the corner of the ceiling. A rerun of Jeopardy is on TV. And this...
There has to be an instance where someone tried to put another person inside a washer. I mean, no one would make a rule like that if it's somehow possible to actually do it.
Maybe this is one of those times where the manufacturer just said "Hey, people are becoming assholes and we don't want them to affect our machines. Let's leave a warning."
Now I just wonder how many midgets are killed in washing machines every year.