Fact 1: Over the past 20 years, automobile companies have introduced a number of safety devices such as seatbelts and air bags.
Fact 2: Over the past 20 years, the number of highway fatalities per mile driven has increased.
How can you reconcile Fact 1 with Fact 2?
Congratulations to Jeff Staudt for being the first to submit a satisfying answer to the above conundrum. Take a hard look at the picture above and then read his answer in the comments section. Essentially, Jeff is describing what is commonly referred to as a "moral hazard" problem. The idea of using a spike on the steering column has been attributed to Sam Peltzman. Here's a related cartoon.