Adidas' Sambas. They look stylish, but more importantly, they're designed for indoor soccer (football, depending on your part of the world) so they are comfortable while doing sudden sprints, dodging opponents, kicking hard objects, etc.- all the typical activities you would usually find yourself doing when bad weather turned that 45 minute layover into only 10. It's a bad habit I have as somebody living in Japan, but I don't even untie them at security, just pull them off and on again.

And my heart goes out to anyone wearing sandals/flip flops who gets a bag dropped on or rolled over their toes. Beyond comprehension, but I've seen clumsy passengers do it to others in the airport or during boarding too many times to count.