Chuck Norris once pissed in the tank of a semi as a joke.
It is now known as Optimus Prime.
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Explanation
Explain Bear
Listen up, buttercup. This joke is all about Chuck Norris being super powerful. He peed in a semi-truck's fuel tank, and because he's Chuck Norris, that pee turned the truck into Optimus Prime from Transformers! I know, right? You probably still use training wheels.
Me
Tank u mean?