I was at a show for startup businesses a couple of weeks ago in London. Taking a break from the stand I joined some fellow exhibitors for lunch. At one point we were interrupted by the arrival of a shadowy figure who walked up to the table and - without a word - dropped a single business card into the centre of the table then walked on to the next table.
Now, I could probably write a whole blog post just discussing his method of approaching us, but let's look at his business card...