Computer errors are said to have caused some Tesco supermarkets in Scotland to start selling 45 bottles of lager, or 36 cans, for just £11.
The actual offer had meant to be "Buy three boxes of beer and save £11," - so when shoppers started getting it considerably cheaper, they quickly told friends.
This prompted other beer-lovers to go and try their luck and so many bombarded some stores that police were called to deal with congestion in and around the car parks.
Something tells us the officers may have wanted to pop into the supermarket and try the offer for themselves too… how many crates of beer can you fit in a police van?