I went to the fabric store to pick up 3 yards of material ($7.99 a yard) and a package of buttons ($1.75). The material was on sale, 30% off.
So the girl starts ringing me up. They didn't have a cash register, just a calculator and a "cheat sheet" with all the sale prices.
Mistake #1: She looks up the 20% discount instead of 30%. Naturally, I point this out.
Mistake #2: She looks up the 30% discount for $6.99 instead of $7.99. I'm a fairly honest guy, so I point this out as well.
Mistake #3: I'm not sure how she did it, but she ended up with the store paying me $2.something to buy the material. So she has to ask a coworker how to add things up.
Mistake #4: Instead of doing 5.59x3, she types 5.59+3 on the calculator. OK, now this is getting ridiculous. I wanted to get out of there, so I didn't say anything. She's already been corrected 3 times, twice by the customer. If the store was stupid enough to hire someone so incompetent, then they deserve to lose money.
Interestingly, she actually got the tax correct.
So I ended up getting nearly $28 worth of stuff for $11. Yay me!