Times in a series where you went "Oh yeah, I forgot that part"?
Sorry about the somewhat clunky title. But, what're some case where you went back to an earlier installment/chapter and see a particularly strange moment? Whether it be a sudden quality drop/increase, early installment weirdness, whatever.
Yu-Gi-Oh has the first 7 volumes in general. As many people probably know, Yu-Gi-Oh originally started as a series about games in general. So, before Duel Monsters became the primary game, there were a number of crazy moments. For example, remember that time Yami Yugi lit an escaped convict on fire? Or that time he dealt with some yo-yo wielding delinquients by also lighting them on fire? That time where he and some asshole played ice hockey, except the table was a fucking grill, and the "puck" was a piece of ice with a vial of nitroglycerin inside? That chapter where Yugi and Anzu go to a water park, and Yami Yugi has to play Solitaire with a terrorist? Then there's the chapter dealing with Yugi's friend that's a massive fan of Not-Spawn and thinks he's an actual superhero. And then there's all of Death-T, Kaiba's giant killer amusement park he made to get revenge for Yami Yugi's penalty game on him, with such attractions as "laser tag, except you're up against soldier with actual guns" and "a haunted house staffed by an actual fucking serial killer." It's certainly entertaining to say the least.