As a junior enlisted Marine awaiting training, I have quite a bit of free time on my hands. It's wonderful, and I love having the opportunity to go work out and do my own thing, but inevitably, some of us are going to get bored.
Queue the Indocs.
The newer Marines to arrive on station, or "Indocs," are fresh out of Marine Combat Training (MCT) and essentially boot as fuck. Imagine a small child with no understanding of how the world works, and you've got an Indoc. It's nothing to be ashamed of--I mean, everyone had to be the new guy at some point--but they'll still be made fun of relentlessly for doing stupid shit when they should know better.
Anyway, whenever Indocs move into the barracks, they are assigned a room at random with someone who's usually been on station for a relatively long time. Usually that individual will introduce the existence of "Indoc pizza night," where the Indoc has to buy pizza for all of the roommates who previously lived in the room...think of it as an offering of sacrifice to a vengeful deity.
Sometimes, though, we get bored.
For example: this weekend, one of my buddies got two indocs assigned to his room. He then had four other friends help him in convincing them that they needed to take the mattresses off of their beds and carry them downstairs to the Staff Duty Officer to serialize the mattresses.
Poor fuckers carried those damn things all the way down the stairs and staged them, only to realize that 20 people were following them, laughing and filming the process.
Nobody got mad; in fact, they thought it was pretty funny, and laughed it off with us. It's all in good fun.