“Oh! We got another Christmas card!”
“Cool! Who is it from?”
“It's from XXX.”
“Wait! He mailed it? He actually used a stamp?”
“Yes.”
“He lives across the street!”
“That reminds me, I have to mail him his card.”
“And you're going to use a stamp to mail it to him?”
“Yes!”
“Why not just walk it across the street and put it in his mailbox?”
“Because it's tradition. And isn't it illegal for civilians to put items into a mailbox they don't own?”
“Oy vey.”