Back when I composed MIDIs, I made this nice melody for some game I was trying to do, and a few months later, someone came across my site and told me that the melody seemed to be stolen from the theme to Casper: The Movie, of all places. I was like wtf, I haven't seen that movie in years. But I downloaded the track in question and I was like wtf I subconsciously stole. Likewtf. :(
And now I've done it AGAIN. I knew the drum intro for 新しい 二 was taken from somewhere, but I could find no clue at all as to what it was from, so I decided hey, it must be my own idea. A month later, The Earth Light by L.E.D. Light (from beatmania) shows up on my iPod and I'm like ARRGG ANGER.