It's because of all the crude oil they keep ingesting.
Interactive Joke of the Day Mug
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Crude Oil.
They're all going to be 65 this year.
Tell them to take off their hats
For me, it's gotta be Emo Phillips' Baptist joke. Although to tell it you've gotta get his execution down.
So that they could make fish and chips.
Because pepper makes them sneeze!
He became enlightened.
They're always getting com-busted.
Head Russian...
White Russian, Straight