In the "In Between" billiard trick shot, Vincent Facquet pockets 4 object balls in a single shot. Each ball falls into a different pocket. To pocket the last remaining ball, the cue ball has to make a curve and pass in between two rows of colored balls.
At the beginning of this billiard trick shot, 3 of the object balls are lined about 5 inches from a middle pocket. The 4th object ball lies near the player's right corner pocket, on the same side of the table as the 3 balls. Two rows of colored balls perpendicular to the rail with a gap of about 5 inches between them. The object of the trick shot is to cause the cue ball to pocket the three ball, each one to a different pocket, and then to make a curve, move in between the rows of balls and then pocket the last of the object balls to its nearby pocket.
It may sound long and messy, but the billiard trick shot itself lasts only a few seconds! Take a look: