The is a Poser animation done using PoserPhysics2012, which provides a more realistic simulation of bowling pins than using a box for each pin. Each pin is made up of 5 rigidly joined props, which better simulate the movement of a bowling pin when hit by the ball. The density of the top small ball, and bottom small box in each pin can be adjusted to give different weight distribution in the pin. The friction and bounciness of the components can also be adjusted to give the desired effect.
I will do a full video tutorial on how to do this once PoserPhysics2012 is released.