I started many unsuccessful side projects, making me almost no or no money at all. The latest one (WunderFlix) is different though. It starts making a modest amount of money. But since I never made any money with the other projects I still don't like to talk about it.
But, now that you've asked... I always wanted to have an app that can help me creating short films of my kids with my iPhone. I searched the App Store and found many, but they were all so complicated to use. I wanted simplicity. After all, I have kids, and thus no time to fiddle around with a complicated and long process to create the films. Since I could not find the app I was looking for, I decided to create it myself :-)