When I first started out and I had to consult the forums on how to make a room... and talk in-game.
Soloing my way to ultimate mode, with nothing to my name but store-bought equipment, a naturally-evolved mag, and my own stubbornness determination. Killing Olga on my own after all that struggle was totally worth it. Then ultimate mode kicked my ass and I had no choice but to embrace the O part of PSO. Luckily, Ultima's community has a reputation for being really really nice, as many newcomers will comment on. I got low-end rares and a Frozen Shooter just for flailing around like a derp.
Meeting Stark and later Spot, and getting advice from players like Saith. That's around the time I started delving into the meta game. I started looking into max stat plans, paying attention to mechanics I otherwise brushed aside, and tagging along on harder quests and rare hunts. Now Spot is grooming me and a few other scrubs into becoming super hunters. I've gotten so much good stuff. I love you all. <3
Being a team of lv 150-somethings, and getting OKHO'd by Olga... on V. Hard. It might've been a critical hit, but it's still something we vowed not to talk about until now.
Killing Sil Dragon and seeing a red box, thinking it was a Holy Ray or something, only to see it was actually an untekked Frozen Shooter that Stark placed under the corpse.
And more recently: doing Weather Effects and accidentally tripping the laser traps. I didn't think it was a big deal until the traps started belching Megids at us. Thus, anyone who trips the (Megid) traps is considered to have "Pulled a Rani," or to have "Rani'd." It's not everyday you get a verb named after your derps.