Well I don't have a fence and 99% of the time when I let my 2 outside they don't run off. But I REALLY hate it when it's late at night and I take the doggies out to potty one last time before bed, and a jogger comes running by...well of course BOTH doggies are running after the jogger and I'm in my PJs running after them yelling. VERY embarrassing!
But, what I usually do if the "You wanna treat?!" thing doesn't work is say, "Daddy's home!!!!!!!!!!" in a really excited voice. They know who Daddy is and they always come a runnin'. It's so funny!