Video Indicates Thermal Flash at JFK's Head - ORIGIN OF GUNSHOT - Jackie Tucks Something Into Seat - Alleged Bullet
This is the Zapruder version where it can easily be observed that Jackie whips something down into the seat with a very quick, brief motion. It's somewhere just before or about frame 10:07. Then, later just around or after frame 14:00 it is shown again and again.
There are several frames of an alleged actual bullet which reportedly emerges upward from JFK's head.