I was taught this too growing up in rural america. Did it myself at some land my grandparents had.
Best explanation I’ve heard for why it “works” is that when looking for places to first install pipes the location tends to be obvious or intuitive, so then years later when someone needs to find it again we naturally trend to the same rough area, pull out those stupid rod things and when they randomly cross there’s a pipe there cause we’re already standing in the general right spot. Get a high enough success rate and our brains start to think there is causation to the correlation.
I had a boss who would send audio messages constantly. I’d be having a conversation with him, he’d get a text message on his phone, stop talking to me to mess with this phone, do a voice recording, mess it up cause he’d whisper it so others wouldn’t hear him (we still totally could), repeat it, rinse and repeat until he got it right, send it, then would ask me what we were talking about.
I’m convinced people who use voice messages have no situational awareness and are potentially psychopaths