One percent

You can make it up in volume...

My line of work comes with a special taxonomy. When something funny happens in the sphere of what I do, usually only one percent of people are going to really get it. Even then, sometimes a percentage of that one percent will truly get it. This is not by virtue of elitist exclusivity, it's just not that many people do what I do.

Sometimes it's really easy.
Somtimes it's a little harder.
Every now and then, serendipity.

Even the media is starting to pay some attention to a really excellent comic called xkcd.