There are hundreds of actions you do in your everyday life that are actually done in their way because society has instructed its members to behave that way. You don't walk on the grass when there's a concrete sidewalk available, even in unrestricted public areas. You wait for the green light at an empty intersection. You wear shirts and shorts on a hot day that you spend all day inside your room. You use napkins to wipe your fingers and face but paper towels to clean up countertops and spills--and would never dream of interchanging them.

There are also thousands of actions you do in your everyday life that are done a specific way for a reasonable purpose. You walk on concrete to avoid dog droppings hiding in the grass, you stop at the red lights in case cops are nearby, you wear clothes since a roommate or family member may unexpectedly need you to come out, and your napkins are scratchy but cheap while the paper towels are more absorbent but more expensive.

But hundreds and thousands of these things are less for direct function and more for social convention. Clothes prevent sunburns and scrapes, provide comfort and warmth. But you wear them primarily because people wear clothes. You wake up, do bathroom things, and then put on clothes because it's part of the process. You choose airy, breathable clothes on hot days, and layers of thicker clothes with more coverage for the cold days. You choose plain clothes for comfort or stylish clothes for social events. But you still choose from the clothes options, not from the not-clothes options. It's because society requires you to wear them, going so far as to have a public nudity criminal offense to those who break the mold.

However, now you, specifically you rather than the general you, don't care about society. That's why you eat its members with no regrets or concerns beyond your own satiation and satisfaction.

People use toilets to dispose of their bodily waste. Feces and urine are found by most members of civilization to smell offensively and look disgusting. The toilet allows it to be expelled discretely and unobtrusively. But you don't care who gets offended in this hallway. You'll probably end up putting them into your bowels and turning them into similar feces some time in the future, depending on how long you can keep this gig going.

So, you leave the classroom, and in the silent but bright hallway, you pull down your shorts. Thinking logistically, you shuffle over to a corkboard on the wall and rip a whole bunch of flyers from the wall--to use as toilet paper. Going back to the center of the hall, you next pull down your panties. You lean back slowly and let yourself fall, cheeks slapping against the dusty tiled floor. And you start pooping.

As an act of individualism and self-empowerment.

And because you couldn't be assed to find a bathroom.