Popped into Halfords yesterday to buy a couple of brake line flare nut spanners while they had their 15% off offer going.

Wanted 9x11 & 10x12 sizes, priced at £5.29 & £5.49 respectively.

Got to the till and the 9x11 scanned as a 7mm combo spanner at £3.99, then the muppet on the till tried to work out in his head what 15% of £9.48 was. He came up with £3.00, which he then took off my total, making the two spanners £6.48.

I said thanks very much, and f****d off out the door before he changed his mind.