It must take some practice. I watched a guy in a silver flight suit climbing over the fence at McCarran Airport, and the barbed wire had caught the crotch of his flight suit. I dropped off my passengers and moseyed on back a few minutes later (I am nothing if not curious), and he was still there. I went back and notified airport security.

As I delivered my next load, there was a man using one of those tightener things on the fence in that spot.

OUCH!

Sue