[mettamage]

The Selfie Stick comes to mind. It's the simplicity of the idea that I find genius. Back when I first saw it, I couldn't see the appeal of it. I was biased though, since I did not have much trouble with making selfies and didn't care much about them.

Then I went on vacation to the US and was considering buying one... A few good YouTube videos showing how to use them creatively helped as well. These videos weren't made by the company itself, but by passioned YouTubers who didn't have a camera man.