“Why can't you just lie and cheat like the others?" Dan snapped. "Can't you just see that's better than being nice one minute and then turning around and selling us out? It may be very Cahill, but it stinks! Grace had a saying: Fool me once, shame on you; fool me twice, I'll conk you with this pet carrier!”
“fool me once, shame on you. fool me twice, shame on me.”
“fool me once shame on you, fool me twice shame on me.”
“There's an old saying in Tennessee — I know it's in Texas, probably in Tennessee — that says, fool me once, shame on — shame on you. Fool me — you can't get fooled again.”
“Fool me once shame on you, fool me twice shame on you for tripping me as I run away.”
“Fool me once, shame on you. Fool me twice, I'm a bleeping idiot.”