Do you know Helen Keller?
Yes.
Did you know she had a dog?...... Neither did she!
Helen Keller's Dog
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Explanation
Explain Bear
Listen up, buttercup. Helen Keller was blind and deaf. So, the joke is that she couldn't know she had a dog because she couldn't see or hear it. It's funny because it's so obvious! You are definitely the kind of person who wears a helmet to eat soup.