I never grow tired of this conversation, which just happened to me again at a lunch counter.
Clerk:"You're total is, ahem, . . .uh, [clears throat] $6.66."
Me: "Thanks." [Hands her a ten dollar bill]
Clerk: "If you don't want anything else, I'll take the tax off. It will make it a different total."
Clerk: "You know ... The Number."
Me: "Nah, thanks anyway. I'll pay the full amount."
Clerk: " What if I pay the tax myself?"
Me: "Thanks anyway. I'll pay the total."
Clerk: "Ohhh-kay . . ."
She said it as if she meant: "It's your funeral." I didn't stick around long enough to ask her about what she thought of health care reform.