Not exactly a public sign but good for a giggle nevertheless.
Our office went through a phase in which everything had to be clearly labeled. For example, the clear, plastic box containing pens had to have a label saying 'pens'.
Mostly, we used basic copier paper but, for nicer letters, we also had a box of bond paper. Like everything else. It had a big label saying 'bond'.
Someone added, 'James Bond'.