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rusureamisure has the same response as me.
Truly a well-mannered person!!
Let's see if I can put it in a scenario:
The front door was closed as I walked down the sidewalk to my parents house. They knew I was coming so I gave a friendly knock and walked in saying, "Hey! Hey!" There was no was response so I set down the bottle of wine and went to my sister's room down the hall. The door was closed. I knocked and she wasn't there. That's cool. I left her door, unopened and ventured further down the hall. At the end is my parents bedroom. On their door hung the, "do not disturb" sock.
With a smile on my face, I walked back to kitchen and opened the bottle of wine. I knew they would be out in 45 minutes.
They've had a lot of practice. 45 minutes is about right.
;) :)