In one scary episode of the series, the beloved diner Arnold's catches on fire. What causes the flames?

In the episode with the ridiculous title "Hot Stuff, Al," Chachi gets careless with his apron after Joanie agrees to go out with him. Because he's so excited, he just tosses his apron on the grill and a huge fire ensues.

Asked by Tom Cohen · Last updated 5 years ago · 253.4K views