Kind of a lame example that depending on who you are may make you go, "Uhh... yeah? Duh?" but...

Y'know how Hollywood has been using the same library of stock sounds for like half a century? Wilhelm scream tier stuff? Like, if I had a nickel for every time I've heard one of those stock baby noises, or that ape screeching, you know the ones, I'd have a good chunk of change by now.

And if you ever encounter real world examples of some of these things, they never sound quite like those recordings. This is in large part because Hollywood loves pairing sounds of specific creatures or objects with footage of completely different creatures or objects that in reality sound nothing like that (e.g. no, bald eagles do not make that noise at all). So these sounds become reified in your head as "the sounds fake shit in movies make". The acoustic equivalent of what fruit flavored candies are to actual fruits. Does that make sense?

All this to say, it's really disorienting when you encounter things in the real world that actually make these noises. Particularly if you aren't regularly used to being around them.

For me in particular, it's roosters and horses. My mind is conditioned to assume that the stock noises for these creatures I hear in films and the like are, I dunno, extremely cherry-picked noises from some specific breed or species of the animal that aren't the ones I'd commonly find around me. Not the case! They really do sound like that! To a spookily accurate degree, too. Being around them feels like someone is pranking me with a soundboard, I almost can't believe it's real.

It's a bit depressing that sound design of film has disillusioned me to the point I'm shocked to hear that roosters in real life actually sound like roosters in movies and on TV, but nonetheless here we are.