I remember the Chicago Bulls dynasty and "America's Team" Dallas Cowboys. 2 of the biggest bandwagon followings in sports at the time. I always rooted against them lol.
WWF, WCW, and ECW wrestling was big. NWO storyline had to be the biggest event that decade IMO. We really thought the NWO was sent in by Vince and the WWF at the time lol. ECW was very underground at the time. If you lived outside of the northeast it was really hard just to get footage.
Oldschool console wars. With Nintedo vs. Sega vs. Sony. Does anybody remember the Sega Saturn? lol.
90s cartoons: Simpsons, Fox Kids' X-Men, Batman the Animated Series, Spider-Man, my personal favorite Beavis and Butt-Head. I remember people trying to censor them so bad. Getting the word "fire" banned. They kept pushing back their time slots from 7pm to 7:30pm all the way to 11-11:30pm. I used to stay up on school nights just to catch the episodes.