26 is a well-known score to darters, because if you are throwing at the 20, it's easy to miss by a little bit on either side, and end up with a 20, and 1, and a 5, for 26 points.
Of course, there are other ways to score 26 points. Once I wondered just how many different ways there were. The ensuing calculation yielded this factoid, supposing that the order of the three thrown darts does not matter (e.g., {0,6,20} is the same as {20,6,0}), but that, e.g., a double-10 is different from a single-20, even though they score the same.