We humans are visual creatures. We tend to understand and learn best when we can see and touch not just read or imagine. Case in point, everyone over the age of two is familiar with the universal "no" symbol. We see it constantly, probably almost daily. Sometimes these signs are so incredibly obvious, they become amusing.
The other morning while inspecting a moderately sized house, I opened one of the four electric panels on this property. As the cover came away from the box, I noticed a large sticker in the bottom of panel. Nothing greatly unusual about finding stickers in an electric panel. The electricians tend to leave the circuit label stickers inside the box regularly. This sticker however was different, being that it was large and mostly white. The most unusual thing about this panel box was not the sticker, it was its location.
It was in a bathroom.
Now it would seem to me that anyone who has completed at least the third grade understands the concept that electricity and water are not a good combination. The National Electric Code sure understands and forbids installing electric panels in bathrooms. This panel was very conveniently located next to the commode. Just in case you need to flip a breaker while, um, mediating.
Oh and that sticker was obviously meant for outside the electric panel. It had to have come with the toilet. It is a slight variation on the "no" symbol (everyone wants to be different). The message is pretty obvious.
I think they should have put an electric panel on there too, but that's just me.