Usually the result of a long cramming/programming/writing session, the tower of pop cans is created by someone who needs lots of caffeine, hates coffee, and is too busy to go recycle them as they are finished, instead getting lined up until spare horizontal storage space is used up. Then the cans become a tower of pop cans as surplus used cans are stacked. This can easily reach four or five tiers. The pitfall of the tower of pop cans is the quarter inch of fluid remaining in the cans, composed of leftover soda and saliva. When something (inevitably) collides with the tower of pop cans, each of these "empty" pop cans are armed carbonated spit bombs flying in different trajectories, unleashing their payload simultaneously.