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Funny aside, I think it’s more about preventing escape
Or to keep people from being hit by the door.
Or to let them get their finger out of their nose
Yes, nose.
I am a veteran and I never knock
In that case, you’re not a true vet #notruescotsman
No, it is a sign of respect. The human is asking permission to enter my dominion.
Source : I am an animal (in bed), according to my girlfriend… Specifically a pig, according to my wife.It’s just in case the patient is Welsh.