The "Machine gun" is one of the most well known trick shots in pool. 9 object balls are lined in a row near the middle pocket. The trick shot artist, Vincent Facquet in this case, shoots the balls and pockets all of them into one corner pocket after driving each ball in rotation to hit 3 rails. The sound of the 9 balls hitting the rails resembles the noise coming out of a machine gun.
The entire "Machine gun" trick shot lasts no more than 10 seconds. Facquet hits the balls so fast it's hard to tell whether he has been using the cue ball. If you watch closely, you'll notice that there's no cue ball in picture. Usually, in the "Machine gun" trick the cue ball is shot from a space between the balls.