Why did the crumb cake isolate himself? He had a crumbling social life.
Crumbling Social Life
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Explanation
Experiment
This is a pun. The joke plays on the fact that crumb cake is a type of cake that crumbles easily, which is also what it means to have a "crumbling social life". So it's using the word "crumbling" in two different contexts. It's a play on words!