When I was about 16, I wanted to build a go-kart. And not just a gravity-powered seat, but a proper go-kart with a gas engine. Where I would have driven it is a mystery, but I started the project anyhow.
One software project I wrote on the side was an SMS autoresponder, or SMS bot. The fun began as early as planning, and I had some neat features to build into it. For one, a bus schedule lookup. And random fortune cookies. Also the obligatory weather report. Plus a stateful game of Farkle, because why not?
A few years ago I was interested in location-aware phone apps, and experimented with that sort of thing using my Blackberry Bold 9000. I didn’t know what I wanted to make. But it was going to be awesome.