Why do orphans not know if they're lactose intolerant?
Because their dad never came back with milk.
The Lactose Intolerant Orphan
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Explain Bear
Alright, listen up, you knucklehead! This joke is playing on the sad fact that orphans don't have dads, right? And it's also making a pun about lactose intolerance, which means some people can't drink milk without getting a tummy ache. So, the joke is saying the dad went to get milk but never came back, implying he abandoned the kid, hence the kid is an orphan. Get it now, genius?