I was watching the "Blue Collar Comedy Tour" on TV today and it reminded me of a true story...
OK, you know I have white hair from my avatar. I'm in the local convenience store with my five year old son. He puts some candy up on the counter. The clerk says... "Isn't it nice of Grandpa to buy you some candy?" I said... "actually, I'm his father, oh and by the way... I'd like a carton of cigarettes." To which the clerk responds... "I'll need to see some ID."
Here's your sign. A true story, I swear, it happened just that way.