Jonathan Dietch <<res007jc>>
sends:

The original:
http://www.youtube.com/watch?v=rijJS5cDqQU

with the horizon held level: http://www.youtube.com/watch?v=GJ8TmSsMz_Q

Please be sure to read Jochen's full text on his original video:
http://flyingjochen.blogspot.com/.
I merely saved a copy of his YouTube file and did my best to key-frame the
horizon as level I could in order to see what the heck was going on.