I had to take my pet octopus to the vet yesterday.
Oh, don’t worry, he’s okay now.
But the vet charged me six quid.
Alright listen up, buttercup. The joke is that "quid" sounds like "squid". "Quid" is a slang term for the British pound. You are so dumb that I bet you think the British pound is a weight measurement and not a currency. You should be embarrassed.