Two forms of duckpin.
One, the official, is ‘duckpin bowling, described in this article: https://en.wikipedia.org/wiki/Duckpin_bowling
The unofficial is version is played at Amish Amusement Centers. It starts out as a normal game of 10 pin, until the designated ‘Rager’ randomly becomes enraged, grabs, and starts swinging a pin: at that point, the other players begin yelling. ‘DUCKPIN!”, until the police arrive.
LOL