Jackie Chan was the greatest martial artist/stuntman/comedian/choreographer ever. This was primarily because he did not give a fuck about his personal safety.
If you are really, seriously telling us that you have no idea who Jackie Chan is, or why you should like him, it's probably best to start with some of his best scenes.
Bench vs Bench!
The single comment below this video sums the scene up pretty well: "the best battle with a fan of all time."
Shin Attack! (3:30)
Versus Benny the Jet!
The following is Jackie Chan's own top stunts chosen by him in 1999, which is lucky since his English speaking films got a bit shit after this (we're looking at you The Tuxedo).
All of Jackie Chan's films since Police Story have featured outtakes, as proof of him doing his own stunts. It also makes us laugh to see people hurt themselves.
These are the outtakes from Rumble in the Bronx. It is important to notice that he continues filming stunts while his leg is in a cast. It explains why he has no insurance on his body at all.