Monkey Butt Fire Sign
Japan has an abundance of signs telling people how to behave in public spaces. Many taxis have signs with a two horned person illustrating what not to do. Some signs seem self evident, like don't electrocute yourself with a selfie-stick. I searched for videos of bullet trains hitting selfie sticks but nothing came up. I honestly felt relieved, I was sure I'd find one. I did find a recent article about a disgraced train driver...
These signs all made pretty good sense.
This sign did not.
I ran this through Google Translate and now know that the main message is "Protect Arashiyama from fire".