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The self service till is usually a shopper's arch nemesis. "Unexpected item in the bagging area" is a phrase that induces rage across the nation.

But one Tesco customer was unexpectedly pleased by the till he used - when it did him a bit of a favour.

Josh Knight took to Twitter to tell Tesco that one of their self service tills not only failed to charge him for his Jaffa Cakes, it actually PAID him to buy them.

So technically, he got free treats and a bit of extra change for the trouble of eating them.

Tesco staff swiftly responded, light-heartedly telling him they hoped he enjoyed his cakes since he was being paid for them.

(Image: GETTY)

He then decided to give them a little review.

Next, Tesco decided to try to get to the root of the problem by finding out where exactly this malfunctioning machine is, asking him to give the name of the store.

Think again, Tesco. This guy's not going to give up his ally.

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He was instantly backed up by other Twitter users joining in on the joke, one of whom told him: "Stand your ground don't give them nuthing. Trying to get a lad to grass, disgusting behaviour by Tesco." (sic)

Another tried to get a piece of the action, asking him: "Can you DM me the store josh. Im hungry" (sic).