My computer lab is arranged in rows starting with Computer Tower # followed by Computer Monitor # packed like canned sardines all the way across the room.

I assume since today was the last day before campus closes again for the holidays and remote learning, it was packed. There were only a couple stations open, and each had people on either side, so I bit the bullet and sandwiched myself in between a coupla people, set my bookbag on the ground to the right of my seat, pressed a coupla keyboard buttons and did a coupla mouse clicks/swipes to get the monitor to awaken. When it didn't awaken, I pressed the monitor button. The screen came on and said no input or whatever, so I reached with my dominant right hand to press the power button on the computer tower to the right of me.

To. The. RIGHT. of me.

Of course, I do not realize what I had done, but I do notice the guy to my right has been doing back to back triple takes between my computer and me ever since I pressed the power button. He looked at me one last time, and he said gibberish to my ears. I blinked cluelessly and remarked, "I'm sorry, I didn't hear that. What did you say?"

As he repeated himself, "That's MY computer," my eyes widened and darted away from his face and focused on his screen, which flashed the blue "Shutting down" screen with the circular loading icon we all know.

Mortified and stunned speechless as I realize the computer tower associated with my monitor is to the LEFT, I dumbly stare as he says it is fine. I stammer apologies, and he says he wasn't working on anything that wasn't auto saving anyway. Bless his fucking heart. I proceed to press the correct power button on my computer tower to my left, and I see my computer is starting to turn on, so I start pulling out my study materials to settle in for one final productive session with a tutor around before winter comes with the hefty finals guillotine. I retrieve my earbuds from my bag, and I plug them into the computer tower to my right.

to. my. RIGHT.

I, again, cluelessly continue on with settling into my cramped study nook and realize the guy to my right is staring at me again and pointing at something in the air (he's pointing directly at my earbuds - I'm such a dunce), so I pull one bud out, and he says again, "That's my computer."

At this precise moment, I contemplated disintegrating into a pile of insubstantial matter or packing everything up and exiting the room, but alas, I buried my head in my arms, collapsed exaggeratedly on the counter in embarrassment, and laughed it off with a loud huff before unplugging my earbuds and apologizing profusely. Again.

He proceeded to now ask me what my major was, how long I had been going to school here, etc....*sigh*

TL;DR I almost erased someone's work by shutting off their computer tower as they were using it because I thought it was mine, and I embarrassingly reflexively plugged in my earphones to their computer tower even after realizing it was not mine.