Andy J. Forest is one of my favorite harp players. Here is an old video of him in Assolo. I love the technique that he calls chucka chucka, but I can't do it like him.
An upside down, backwards player usually tends to be left handed and self taught as a rule and there are a lot more than you think. Both Sonny Terry, Paul Butterfield and William Clarke were lefties and did it that way. There are some very famous blues guitarists who played upside down and backwards on right handed guitars that normally, a lefty would restring but didn't and thw very first two who come to mind are Albert King and Otis Rush.
Even classical chromatic virtuoso Cham-Ber Huang also played this way. In his old LP/harmonica instruction set he put out many years ago, he basically said you kinda have to learn to play the instrument almost like you were blindfolded. ---------- Sincerely, Barbeque Bob Maglinte Boston, MA http://www.barbequebob.com CD available at http://www.cdbaby.com/cd/bbmaglinte