Star vs. The Forces of Evil: Back in February I saw the intro promo for Star vs. The Forces of Evil and it seemed like a pretty cool cartoon so I got excited for it and got hooked on it instantly after the first episode came out.
MLP: A friend of mine who I used to play Garry's Mod with told me about it. I watched it and I actually liked it.
Adventure Time: Back in 2012 I saw an episode on Cartoon Network late at night as I was going to sleep. (I sleep with the TV on, watching shows ;p) And I continued watching it each night until I'd seen all of the current (at the time) season's episodes.
Fallout: After I'd finished Skyrim (and I mean fully finished, I'd explored everything), I wanted to play more games like it, so I got Fallout: New Vegas, played that for ages, then got Fallout 3.