Why did the bodybuilder go to the crustacean church?
Because it was a good source of mussel mass!
Mussel Mass
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Explanation
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Explain Bear
Listen up, buttercup. This joke is funny because "mussel mass" sounds like "muscle mass." Bodybuilders want muscle mass. Mussel is a shellfish, and the crustacean church probably has mussels. You probably don't have any muscles.