One time my friend was talking about their dream with another friend, and I guess I sort of predicted it because it felt like I had read the whole conversation the day before, even more so when I read a very specific part, it was probably a dream or deja vu but if it was a dream then holy shit I can see the future (Joke, I say I can see the future whenever I accidentally predict something)
But usually the predictions are based off of logic, clues, and whatever knowledge I have about the thing I'm predicting (If you were to ignore the dream thing), so say my friend were about to send pictures of Kim Dokja without shoes, since I know the specific moments he was seen without shoes in the manhwa at the time I could guess what she would send screenshots of (This is a real story btw), so I don't really have many accidentally predicting moments
The only other I guess accidentally predicting moment I can find was when I was watching the HypMic anime, and one of the characters, Hifumi, called another character "Some random guy", I was live reacting in my channel and said "'Some random guy' Hifumi his name is Kazuha...", then I unpause it and the one HypMic character I'm kin with (Doppo) says "He's not 'some random guy.' his name is Kazuha." which I guess kind of counts as accidentally predicting it