My fat friend went to the doctor because he wanted to know his blood type. After performing some tests, the doctor said, "Well, the test results have shown that your blood type is ragu."
Ragu Blood
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Explain Bear
Alright, listen up, butterball. The joke is that "ragu" sounds like a blood type, but it's also a brand of pasta sauce. It's funny because the doc is implying your friend's blood is basically pasta sauce on account of them being fat. You probably have the same blood type, tubby.