Ever since I was a kid I've love attending air shows. In fact, I might be flying aerobatics now had it not been for a medical condition that disqualifies me from ever getting a pilot's license. (Oddly enough, it never stopped me from driving a fire engine, which I did for the last 15 years of my career.)
Nonetheless, last year I saw this act at Janesville WI for the Southern Wisconsin Airfest. It is Skip Stewart flying his highly modified 450HP Pitts Special "Prometheus". This was the most incredible flying that I've ever seen. You know, really, you just aren't supposed to be able to do these things in an airplane. Enjoy!