Customer: *in writing* “Where are the encyclopedias?”

Me: *slowly, making sure he can lip read me* “One floor up–”

(The customer gestures me to write. I assume he can’t lip read. He goes on his way after I write the instructions. Suddenly there’s a crash and he looks towards the sound.)

Me: “I thought you couldn’t hear!”

Customer: *in writing* “Stop talking, this is a library!”