A common thing I see on here is "adrenaline is unique to humans and terrifying to everything else".
Now I know realistically it's unlikely other alien species don't have some sort of survival hormone as well, but in the chance that they don't I feel like there's a lot of untouched potential for this.
Because adrenaline has been discussed for fight-or flight situations before; mothers protecting their children, people lifting cars or buildings off other people, surviving in bullshit situations out of sheer willpower; but the way we play with it has to be a cause of conversation amongst other intergalactic species too.
Like we have rollercoasters, theme park rides, horror movies. We jumpscare each other and teach our kids little hunting games like tag, hide-and-seek, and red light green light. We play video games where we hide from a pursuer in a threatening environment and our bodies react like we're actually being stalked in real life, and we do it on purpose.
Because most other earth animal species have adrenaline (or epinephrine), but none of them really seek it out for thrill purposes like humans do. It makes you wonder what aliens would think of us, since we're apparently little freaks that like to be scared on purpose.