Well of course its arbitrary. I just picked it because it was used in the meme that we are talking about. I could’ve also used physical pain or sexual desire or hunger. It just has to be something that people have experiential experience with. Sight possibly could’ve worked, but I don’t think so. Maybe for you?
Also, I’m not sure there actually are different kinds of adrenaline rushes. Regarding my explanation, I was asked, so I provided it. Just because you do not like it does not make it bad. My point stands. People “get” fear pretty easily, if they want. People cannot “get” sight, without the aid of science training. It’s a key difference between the two, which makes picking one over the other pretty easy.