One winter a resort in Breckenridge, Colorado, posted signs instructing skiers to keep off a certain slope. The signs, large and distinct, said, “DANGER! OUT OF BOUNDS!”
In spite of the warnings, however, several skiers went into the area. The result? A half-mile-wide avalanche buried four of the trespassers beneath tons of snow and rock. This tragedy never would have happened if the signs had been heeded.