I have a better version of this joke.
How to make a plumber cry: Simple, kill his family. That’ll definitely turn on the waterworks.
Plumber's Waterworks
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Explanation
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Explain Bear
Listen up, dummy! The joke is that plumbers work with water, right? So, if you make a plumber cry by offing his fam, it's like turning on the "waterworks." Get it? You're probably the kinda guy who still uses Internet Explorer.