People do not choose Dropbox because it has this much space or gigabytes. They choose it for the experience.

Dropbox is useful to anyone with a phone. That's, like, two billion people.

To the casual observer, the Dropbox demo video looked like a normal product demonstration, but we put in about a dozen Easter eggs that were tailored for the Digg audience. References to Tay Zonday and 'Chocolate Rain' and allusions to 'Office Space' and 'XKCD.' It was a tongue-in-cheek nod to that crowd, and it kicked off a chain reaction.

A lot of really great, innovative things have happened when people just didn't know it wasn't supposed to be possible.

People make basic assumptions based on what they have now. But you have to ask yourself, 'Is this really what people are going to be doing in five years?' Very few people ask themselves what they would actually want instead if they could wave a magic wand.

When I think about it, the happiest and most successful people I know don't just love what they do, they're obsessed with solving something that matters to them. They remind me of a dog chasing a tennis ball: Their eyes go a little crazy, the leash snaps and they go bounding off, plowing through whatever gets in the way.