"69 percent of people who have business cards have gotten a speeding ticket, compared with 53 percent of people in general.
Based on a survey of 298 people who have business cards and 743 people in general."
This is one the truly bizarre factoids available at Correlated.org. Forget the fact that these are self-selected people, and therefore it's not a scientific survey; it's just weird. But from the webpage, the Freakonomics people seem to like it.