What goes through a door but never beyond it?

I know it is ancient, but what is it

Anonymous2011-04-08T07:31:49Z

Favorite Answer

Key hole?

10

Ghost2011-04-08T14:51:42Z

a knob? a keyhole? and my final guess a salesman (i mean what else can go through a door and never go beyond other peopels door)

10

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