Jackie Chan is a master of the Action Comedy, the movie genre combining two seemingly disparate elements. In this installment of the excellent film critique Every Frame a Painting, Tony Zhou explains why Jackie Chan is so good. Hint: it has a lot to do with him getting punched in the face (intentionally). Now jab that play button:

Zhou adds this summary in the YouTube video description:

The 9 Principles of Action Comedy

1. Start with a DISADVANTAGE
2. Use the ENVIRONMENT
3. Be CLEAR in your shots
4. Action & Reaction in the SAME frame
5. Do as many TAKES as necessary
6. Let the audience feel the RHYTHM
7. In editing, TWO good hits = ONE great hit
8. PAIN is humanizing
9. Earn your FINISH