<human>: Can you summarize the given text in a few sentences?

So I installed the extension a few days ago, but the real fuck up was forgetting about it and then doing a presentation with my laptop.

So. I had to do an English presentation on a book we had just recently finished reading, and we had a few options of presenting our topic. I decided to do a slideshow presentation online, and was able to finish it a couple days before it was actually due. Well sometime during the week (I forget when exactly) I saw online this John Cena extension that gave a 1 in 100 chance of opening a John Cena page, so naturally I decided I just have to install it. I play around for a few minutes trying to get it to pop but unfortunately I had no luck in doing so, and then decided to go to sleep. A few days go by and I have completely forgotten about the champ. So now it's Friday and I have to present my presentation. I decide to use my laptop because I had it with me and I had already preloaded my videos that I was gonna use on YouTube. So I plug my laptop in so my desktop can be seen on our smart board, and begin my presentation. About halfway through my presentation I get to the point where I need my video so I go to my other tab and begin to play it. However I forgot that sometimes if you have a YouTube video open for to long it does a weird thing and you need to reload, so I think no big deal, I'll just reopen. Well unfortunately, I did and next thing I know I'm being John Cena'd in front of the entire class. Some people are laughing, some people are confused, my teacher looks pissed, and I swear I must have looked like a complete idiot.
<bot>: Installed John Cena extension, forgot about it, and did a presentation where in which I needed to reload the page. Got John Cena'd in front of entire class.