This evening the Sainsbury's truck came and, mixed in with what we'd ordered, there were 2 tins of button mushrooms. We hadn't asked for those... nor, I have to say, would we ever have done so. They can go straight back with the recycling bags next time.
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At least they didn't charge us!
This made me wonder: what is the most random thing that other people have ever received in their grocery delivery orders?