“DO NOT TOUCH” must be one of the most terrifying things...
“DO NOT TOUCH” must be one of the most terrifying things to read in braille.
This is an absurd joke. People that read braille do so by rubbing their fingers along bumps that represent letters. If one were to read something in braille, then, that person has already touched the object that the words are on. That means that they already broke the instructions they are reading.
Why would this be terrifying? That is where the humor comes in. That wouldn't be terrifying. You already touched the thing, and if it was going to do anything to you because of it then it already happened to you before you finished reading the words.