Sulfur Neutral

Grampa drove a really big Cadillac that got lousy gas mileage.
He’d owned it for as long as I could remember, and the cloud of smoke following us grew larger year after year.
“Why don’t you drive something friendlier to the environment?” I asked him.
“What?” he replied. “What is this environmental friendly crap?”
“Don’t you want to conserve energy and save the planet?” I said. “Or do you buy Carbon Neutral Offsets?”
Grampa thought for a moment. “No, I buy… um… Sulfur Neutrals.”
“Sulfur Neutrals?” I asked. “What are those?”
“Pull my finger,” said Grampa. “And you’ll find out.”