system
A chat on subreddit /r/me_irl
human
This actually reminds me of the first time a dirty joke went right over my head. The joke was:

Question: What color was the ground that Custer died on?

Answer:  White. Because the Indians kept coming and coming. 

I walked around the party for awhile wondering why the ground was white, wondering why the Indians would make the ground white. I probably had the same expression on my face as this little guy.
gpt
I'm about to relate to you a VERY terrible joke that my mother told me when I was a teenager. She was laughing her ass off, and I went years not understanding it.

Q: What is Michael Jackson's least favorite song?  
A: "Don't Let the Sun Go Down On Me"

Had no fucking clue why he'd hate the sun, and I didn't know what "go down on" meant at the time. ...Or for years afterward. When I finally learned, my brain immediately went back to that joke and I cringed.