Stack 'em. Slam 'em. Repeat.

Sources:

https://en.wikipedia.org/wiki/Milk_caps_(game)

https://www.baltimoresun.com/news/bs-xpm-1994-12-31-1994365103-story.html

http://mentalfloss.com/article/54202/weird-history-pogs

Music: https://www.purple-planet.com/