What weird background sound effect/noise did you pick up on in a song that you could never unhear again?

Bouncing off of the misheard lyrics post, I remembered for some reason there are random background noises in a TON of songs seemingly for NO reason that once you pick up on you can never unhear.

Twice - Alcohol Free has this weird ass random ringing that blew my brains out when I played it in my car with rly high trebles on EQ by accident, it straight up just drones being played at random times like hypnosis

Le Sserafim - Blue Flame has some tinny noise play randomly in the chorus that sounds like someone is stirring coffee in the next room

Twice - TT has a super odd rising and lowering electric noise that sounds like one of those frequency hearing tests on YT, which is also in ITZY - ICY in the chorus

Ive - I am so theres that edit of wonyoung faceplanting and I thought the weird whip noise was added by the guy who made the meme but its acually just there in the song to remind you of the faceplant every time, also in other random parts of the chorus