There are a few members of the Smartass Darters Society who tend to bring out the worst in their opponent. We all seem to find it amusing when someone gets upset at losing a darts match and rather than taking it out on themselves, they begin to express their aggravation at the winning player.
We also have a saying around here; Safety Third. So these particular players wear dart shirts with a firm warning in order to rest assured the competition will remain as drama free as possible. WARNING: The way I play darts may hurt your feelings. I suggest you get over it.