On December 22, 2001, Richard Reid, the "Shoe Bomber", attempted to bring down American Airlines Flight 63 by igniting some Pentaerythritol tetranitrate (PETN) smuggled aboard in the heel of his shoe.
Since this incident, every airline passenger boarding a flight in the U.S. has been required to take off their shoes and have them screened.
On Christmas Day, 2009, Umar Farouk AbdulMutallab, the "Crotch Bomber", attempted to bring down Northwest flight 253 from Amsterdam to Detroit by igniting some Pentaerythritol tetranitrate (PETN) smuggled aboard in his nasty ass underwear.
I'm never flying again.
I don't need a TSA puke trying to divine some meaning from the pattern of the skid marks in my silk boxers!
If I'm forced fly, I'm going commando!