FOX's Malcolm In The Middle was popular for many reasons. Frankie Muniz as the hero. Jane Kaczmarek. Bryan Cranston's biggest role leading up Breaking Bad . And of course, the comedy. On the Internet, however, it's the show's opening credits that's had people talking for over 20 years. The collage of footage (set to They Might Be Giants) includes a ski jumper who is on fire - and people have been very serious about discovering its origin. And we're happy to report that YouTuber Kid Leaves Stoop…