30 people share the run-ins with strangers they'll never forget. An opera singer sat on me.

It's impossible to navigate this chaotic planet without interacting with countless strangers. Most run-ins with strangers are largely forgettable, you sit next to them silently on a train, you serve them food at your service job, you nod at each other in recognition on the sidewalk.

However, not all strangers fade into the abyss of our clogged memories. There are the few, the rare interactions with strangers that echo in our brains forever. Whether it's the silly spectacle of a nude musician, an unlikely meet-cute on the Greyhound, or a guardian angel who swoops in to save our lives, some strangers leave permanent impressions.

In a recent Reddit thread, people shared stories about the strangers they'll never forget, and they range from heartwarming to weird as hell.

1. Crimsonrox will never forget one of their worst customers yet.

"The lady on my plane (I’m a flight attendant) who got really mad I gave her too much coffee and then poured it into the seat back pocket."

"I realized that day that some people will get mad at whatever they can. And there’s nothing I can do about that."