Wanting to show the world the dangers of McDonald's food, the guy in the video smokes a McDonald's french fry like a joint. Because logic.
The no doubt copious amounts of oil, sugar, and starch make the potato sliver an easy thing to light. Although, may we suggest a host of healthier options he smoke for next time? Apples, pears, cucumbers (hilarious), pumpkins, etc. Just nothing that gives your lungs love handles. That's never cute.
The point is, don't try this at home, kids.