Submitter Tiffany says that this is on the door of the bathrooms at the Langley Porter Psychiatric Institute at the University of California, San Francisco. Perhaps "knock first" is their slogan.
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4 comments:
"Open the door" second.
Maybe the doorknob is saying it.
Meh. This one almost makes sense: If there's someone in here, he or she would say "Knock first!"
Yeah, I'm stretching it.
Great to see this post...
thanks for sharing...
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