What do you call a group of cops having a sleep over?
Pigs in a blanket.
Cops' Sleepover
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Explanation
This is a pun. "Pigs in a blanket" is a food, but the joke uses "pig" as slang for cops, so it implies they're literally "pigs in a blanket" because they're having a sleep over.
Lostin Flowers
What's the difference between a hedgehog and a police car? With a police car, all the pricks are on the inside.