RE: JFK Murder Plot "Deathbed Confession" Aired On National Radio
He's laughing at the fact that you have no idea how the JFK assassination went under way.
Ballistics show that the shot came from behind JFK so it cannot be the driver. The angle of inclination of the entry and exit wounds show the trajectory which indicates that it was from a height later revealed to be from the 8th-9th floor.
The FBI is supposed to declassify the JFK case files in 2030 so I'm still waiting for the day
/ 
