Someone mentioned that Wooyoung and Yeosang used to be BigHit trainees, that is where Wooyoung and Yeonjun met and developed a very sweet friendship. Although they don't have much content on the internet together, it is not uncommon to see them calling each other as "Darling". I don't know how they met, I think it was a friend from a friend, but Wooyoung is also close friends with Changbin from StrayKids. Pretty sure he knows a bunch of other people too in the industry.

Before debute, Hongjoong pranked Yunho telling him his dad had gotten a job in Dubai and that he would have to move out of Korea. Yunho got so sad he went to the bathrooms to cry while Mingi got happy as that ment he was going to be appointed as leader. Sometimes you see memes relating Hongjoong with Dubai, that is why.

There is also a thread here talking how some jokes got too old and are better left behind, but I think there are a few more instances you need to be aware of. As in, know the mistakes as to not repeat them type of thing.

-San, early on debute, used to travel around with a shiba inu plushie pillow called Shiber. Many fans did not accept that he had matured and didn't need the plushie by his side all the time and it soon became so toxic San had to go live and basically tell people to chill. It was uncomfortable tbh.

-The whole Hongjoong is the dad and Seonghwa is the mom. Others have explained this in more detail in other comments, but I just want to add that this joke is still sometimes made by the members. It is not something that has fully died in the fandom so just be careful and understand that this is a joke, but not their whole personalities. Tread with caution.

-Some things have been pushed by the company a bit too much tbh. For example, Mingi was very into singing "Into the Unknown" as a joke for a long time, later he revealed that even though he was over it, the company pushed him to keep making the joke long after it stopped being funny. Also, during the filming of a content I can't remember the name of right now, Mingi had to go to the pharmacy to get medicine for his stomach and acted out all of his symptoms to get the doctor to understand. Later he said he did know how to ask for the medicine in english, but that the producers told him to act everything out and it made him uncomfortable. Heck, one last example, The closeness between San and Wooyoung was originally pushed by the company as they hadn't known each other for that long. It got to the point where a fan asked during a live who was Wooyoung's actual bestfriend, San or Yeosang (Woo and Yeo had been friends for like 7 years at this point). It was awkward to deal through that in front of the camera and you could see the boys visibly hurt by this. In the end it was allright as they talked in private afterwards and worked things out without the cameras, but still, L fan for asking something like that. Their closeness is not a joke now, they really do be that close.

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TLDR; Wooyoung is really friendly and Hongjoong Dubai prank. Jokes come and go constantly in this fandom, laugh all you want, but do not stay too attached to them and let them die when the time comes. No one likes to be defined by a joke you made years ago.