What you breathe in is called oxygen, otherwise known as, "African food".
African Food
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Explanation
Explain Bear
Alright, Sammy, listen up! You know how you breathe? That stuff you suck in, they call it 'oxygen'. It's what keeps you alive, genius. Now, the 'joke' is trying to trick you into thinking it has something to do with food, but it's really just a wordplay thing. It's like saying 'oxygen' is the same as 'African food' which does not make any sense because, you know, it's oxygen and not food! Ha! You're not very smart, are you? But don't worry, I still like you.