Unpopular opinion - hated the scene where Joey first slept with Pacey
When I was watching this show during the original airing, I just thought it was so wrong that Joey slept with Pacey. Part of it was that back then, I was a teenager who thought that premarital sex was wrong and thought Joey and Dawson belonged together anyway, but that isn't even all of it - I don't believe that anymore, and I still find the scene disturbing and don't think she should have slept with him. At least not at that time.
It really came off both that he was subtly pressuring her for sex (in the previous episode telling him if they don't have sex now, it's not because of him) and guilting her implying that the reason she wasn't sleeping with him was because she wanted her first time to be with Dawson and not him. And it looks like she largely made the decision to have sex with him to prove to both him and herself that she was over Dawson. Of course she loved Pacey, but she wasn't entirely over Dawson. She changed her mind in one day - she went from not even considering it and wanting the weekend to have nothing to do with sex to sleeping with him. It just really seems like she wasn't doing it for the right reasons. And really, did they have to have sex at that point? They were still in high school. Lots and lots of people wait until at least college. Everything about their relationship went downhill immediately after that anyway.
Nothing good really came out of them having sex. He dumped her a couple of months later. I just never understood why people see that as one of the most romantic scenes on the show. I just found it unsettling and thought she was just pushing herself to do something she wasn't ready to do.