He told me once in an interview, that he started a very little age, and in the mirror it looked cool, because it looked like a normal right hand held one. Then his brothers told him that he holds the guitar the wrong way, but he said "But now I know all the chords" and he didn't change it.
Didn't Hendrix play upside down?
was anybody else choked with how lame Jonas is on stage in this dvd? everything else was perfect except that.