Four months before I became a Pegasister. (I started watching MLP in July 2014.) I was into the Disney movie Frozen like most people. (Around the time when it was released on Blu-Ray.) I would listen to the song "Let It Go" on repeat until I got tired of it. Then I discovered a YouTube channel called "Bin's Toy Bin" and on that day my life changed.
I was also into the video game Portal at the time.
What were you into before you became a Brony/Pegasister?