Here is a good one from the WallyWorld files .
Last week I go to WallMart to pick up a box of 9mm ammo ( white box 100 rounds for like $12 )...lady asks me is it for a rifle or handgun...if it is for a handgun I need to see your ID ( no biggie as I am over 30 !! )...so to throw her a curve ball i answer " well actually neither , it is for a sub machine gun...do you need to see ID for ammo for a submachinegun ?".
Totally blew her away...she did not know how to respond to that.
I gave her my ID , payed and smiled as I walked away .