When I was in college, my then girlfriend texted me that she was watching Jojo Rabbit. She knew it was one of my favorite movies, and said that she loved it too. She was talking about how Scarlett Johannson's shoes almost have their own personality. So I said,
spoiler
yeah, it's devastating when you notice her shoes on the hanging body.
Turns out she had paused the movie to make some dinner, and hadn't seen this part yet. Needless to say, she was PISSED!
There was a class I took in college where we would read a book and discuss it at length. The problem (for me) was that we would read an assigned part, and discuss that part, each week. I, however, read the whole book almost immediately and tried to skim relevant sections prior to class. This caught up to me when we were talking about something, and I mentioned an event that would happen very soon to a main character, but hadn't happened yet. It was an incredibly important event. I really regretted it and the teacher's face was very mixed.