In 2006 I designed the first iteration of this business card, and I’ve been cutting prints of it ever since. In 2010, at an Augmented Reality conference, I handed one of these cards to Amber Case, who took a photo of it and posted it on flickr. In Dec of 2011, this photo hit the number one spot on Reddit, from where it has since been propagated throughout the rest of the internet. It has since been featured on other social media since (9gag) and even the WSJ.
If you’re interested, I wrote a pretty lengthy response to the experience, where I mostly respond to angry internet people.