Ever recall the phrase “When you’re given lemons, you make lemonade”? At Sainsbury’s online shopping service if you’re looking to make grape juice, you’ll get bananas. Or something like that.
See below what happens if you search for grapes:

Search for grapes... get bananas.
I should say that the next few results did take on the more regular vine-grown appearance, but it’s fascinating to imagine what kind of algorithm would determine that a) you probably wanted bananas, and b) you wanted them so much it put them at the top of the list.