The Wild Self-Destructive Hedonism of the British Isles

While the tip may not be sharp enough to be obviously dangerous, when misused, these darts can cause skull punctures and other serious injuries.

On December 19, 1988, all lawn darts were banned from sale in the United States by the Consumer Product Safety Commission. Lawn darts, used in an outdoor game, have been responsible for the deaths of four children, the latest being in early 1997 near Elkhart, Indiana. It should be noted that the specific incident that caused lawn darts to be made illegal also involved beer, and that, when engaged in responsibly, the recreational use of lawn darts is less dangerous than baseball.

Lawn darts remain legal for use in the United Kingdom as well as other countries.
-http://en.wikipedia.org/wiki/Lawn_darts