Burritos and Time Travel

John's lips quivered at the thought of scarfing down the decadent Mexican-ish delight from Taco Town.

"No! Don't eat that burrito!" an old man cried. "I've come from the future to stop you . . . me."

"I come back in time for a burrito?" Present-John asked his future doppelganger.

"Not the burrito per se, but the culminating consequences that develop from eating that—DON'T BRING THAT CLOSER TO YOUR MOUTH!"

"Sorry."

"Thirty minutes from now you develop explosive diarrhea, which leads to several long and expensive medical procedures that leave you destitute!"

"But I get to travel through time," Present-John countered through burrito-mouthfuls.