HOSPITAL FLUNKY: Hello. This call is for Mr. Peter Grant.
FLUNKY: Ah, good afternoon. I'm calling to confirm the billing details for your procedure on (date).
ME: Go ahead.
FLUNKY: The insurance cost for the procedure will be $XXXXX, and your 15% deductible for that procedure will be $YYYY. Will you please provide a credit card number for your payment?
ME: Hold on a moment. That's not a 15% deductible - it's more like 22%.
FLUNKY: The computer says that's your deductible, sir.
ME: Tell the computer to recalculate. Your numbers are wrong.
FLUNKY: But... the computer doesn't make a mistake, sir!
ME: This one has. Get a calculator and work it out for yourself.
FLUNKY: Ah... hold for a moment, please, sir.
(Sound of muzak in the background until the flunky returns.)
FLUNKY: Ah... sir, I'll have to go back to the billing department and ask them to review this charge.
ME: I should think so! [Mentally translates to self: No s***, Sherlock!]
FLUNKY: Ah... thank you, and goodbye.
Dammit, don't they teach mental arithmetic in schools any more? When I was growing up, any twelve-year-old could have spotted that kind of error with his eyes closed!
EDITED TO ADD: Aesop had his own run-in with the arithmetically challenged, on the same day. Go read.