Fads. I mean it. Back when I was 12-13, I remember how I just *had* to have a bubble-necklace, a toll doll and slap-braclets because my girl classmates thought you were nobody if you didn't have those things. I learned I was still a nobody after I got those things. As an adult, I'm not good at conforming to social fads and crazes. Anything I get into that happens to be "faddish" is something I happen to be into because I genuinely like it. My likes and fads don't seem to overlap often.
Ultra Super-Sweet Sugar Bombs of Doom! I know of a *literal* taste I've grown out of. Oh, I still have a sweet-tooth, but I prefer things like dark/semi-sweet chocolate to milk, and I know that there are some things I loved as a kid that were "too sweet" for the adults in my life that I thought I'd love forever and, guess what? I'm an adult who likes more nuanced tastes now. What I mean is, blue-bubblegum flavored Slurpees were my thing when I was five. Now, not so much.
I'm... not even going to bold this one. On the tail-end of my teenage years and into a bit of my young adult hood, I used to read the Left Behind book series. Yes, you may exterminate me now before I breed if you're so inclined, I'm *that* ashamed of having enjoyed those books even a little. To my credit, I only got about a quarter of the way into the series and was reading it mostly for the explosions and a general facination with all things pretaining to the End of the World. I grew bored with the explosions being pre-empted by technobabble and with waiting for a female character to be written with more substance than a Barbie doll and it just wasn't happening. The one good thing to come out of it is that I now can read the Slacktivist blog and know what he and his commentators are talking about when they mercilessly dissect the series.