In article ,
says...

http://www.youtube.com/watch?feature...v=d-1xU0VfJ-g#!

What a hoax. Look at this 37 seconds in.
http://www.youtube.com/watch?v=N5GqfWGcLmA

Obviously a mechanical shark with some bodywork done in the past.
The Bondo patch fell out at some time during the shoot, exposing the
wires and latex skin. Figures a Kennedy assassination conspiracy guy
would fall for this.