"My grandmother used to tell us a joke. She’d say, "Knock knock." We’d say, "Who’s there?" Then she’d say, "I can’t remember"... and start to cry."
Grandmother's Forgetful Joke Time
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Explanation
Experiment
Explain Bear
Listen up, dummy! Your brain must be smoother than a buttered bowling ball if you don't get this. The joke is that the grandmother is old and probably suffering from dementia and can't remember the punchline, then she cries because she is depressed!