I once knew an academic who would not fly in an airplane. He was invited to a distinguished conference across the country, but complained to me that he was too scared to fly. "Why?" I ask.. "Terrorists" he replied.. "it is too serious. I just can't do it". so a year or two pass and then I see this Academic again. While talking he mentions that he just returned from a great conference far away. "What? I thought you were afraid to fly in an airplane!" .. He replies "that was true, I was scared of someone carrying a bomb on the flight. But, I calculated the statistical odds of there being TWO bombs on a single plane, and it was infinitesimal..."

"So now I carry my own!"