The Low-End Approach To Wireless Hacking
Adrian writes "Zack Anderson, an MIT student, created a solution to wardriving on a budget: warcarting. The Warcart is a shopping cart retrofitted with just about every sort of wireless sniffing device available. It has pivoting antennas and a smoke grenade launcher. It can even dispense infected USB flash drives. It's part of a talk about subway fare-collection-system vulnerabilities that will be given at Defcon 16 in a few days." "Mostly as a joke," says the site — but only mostly.
... and too much beer. :P (and this is a smart one)
College kids
I am almost certain that trying to enter or get close to any subway, airport, train station or even walking around in the street will get whoever is pushing the cart shot.