Why do orphans don't like to eat big bags of chips? Because they're family size.
Family Size
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Explanation
Explain Bear
Listen up, buttercup. This joke is playing on the double meaning of "family size". Orphans don't have families, so a "family size" bag of chips is too much for just one person, which is also dark, because they don't have a family. You probably need help with your shoes too, don't you?