Its definately the way you walk thru the scanner. One foot at a time as Jed said!
I was sick of making the Capt. wait each time i had to go thru. I'd empty my life (everything in all pockets) out into the tray. Arrgghhh. Just to have the shoes go off. Bugger!
...and then you would take the shoes off and realise you picked the holy socks that morning at 5am. Doh!