Sainsbury's were left lost for words when one cheeky shopper posted a hilarious, albeit disgusting, 'test' on their official Facebook page.
Clearly inspired by Saw's against-the-clock tasks, the imaginative poster revealed that they had swapped a box of cereal with something a tad more disgusting - and that it was up to Sainsbury's to figure out where the box was, before a customer ended up buying it.
The prankster wrote: "i replaced one box of rice crisps with a box full of my cats used litter on your shelf [sic].
"it is up to you to detect it before a customer does [sic].
"let the games begin [sic]!"
Via Facebook