I just remembered this from the other day... So growing up, my family always called the mailman the 'postman'... So naturally I call the mailman, 'postman'...
My daughter and I were in the living room a few weeks ago and she saw the USPS truck drive up and
She says "Daddy the 'posterman' is here."
I said "You mean the 'postman'."
Her: No the 'posterman'.
Me: No baby that is the 'mailman' he delivers the mail.
Her: No he's the one that brings the posters the 'posterman'...
Me (I am laughing at this point): Well what about all the other letters and stuff?
Her: Oh yeah, you're right (with a chuckle).
So you know you're a poster junkie when you children refer to the 'mailman' as the 'posterman'...