Riddle me this

Having a reflective session in the staff toilet this afternoon I noticed the sign on the back of the door asking people to leave the cubicle in the same way thaey found it (i.e. use the toilet brush when you've have a curry the night before). Someone has cheekliy framed the sign in bright orange highlighter and added three big exclamation points to it.

Only on leaving did I wonder why anyone would take an orange highlighter into the toilet with them. For company perhaps?