"Knock Knock!" "Who's there?" "It's Dave!"
"Dave who?"
Dave bursts into tears, realizing that his grandmother's Alzheimers has progressed to the point where she no longer remembers him.
Dave's Sad Visit
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Explanation
The setup is a classic knock-knock joke, but it takes a dark turn when Dave realizes his grandma doesn't remember him because of her Alzheimer's. It's a sad and unexpected twist on a common joke format.
Scott
This joke is old, unlike antivaxxed babies.
BBBBBBY
Not many can make me choke on water. Congratulations I guess.