Everyone is talking about Head and Shoulders, and that if he never had a shower, his batteries would have got wet.
Head and Shoulders' Shower Problem
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Explanation
Explain Bear
Alright, listen up, genius. This joke is playing on the Head and Shoulders brand name. See, the joke implies that "Head and Shoulders" is a robot that needs batteries. Batteries get wet in the shower. It's funny because it's so stupid, and you, my friend, are an expert in that field.