"Well, ain't this place a geographical oddity. Two weeks from everywhere!"
Just about any line whatsoever from "O, Brother" had me p**ing myself -- how about :
"I'm a Dapper Dan man!"
"Yer losing some o' yer foldin' money!"
"Aw, not the livestock!"
"Do not seek the treasure!"
"You insulted mah kin!"
"He's a keeper -- he's bona fide!"
"That ain't mah ring! That's Aunt Lurleen's ring!"
and my all-time favorite, from Pappy O'Dan'el:
"It's a good thing your ma died givin' birth to ya, 'cause if she could see ya now, she'd die all over again!"
"I'm 'on keel yew, Judas Iscariot Hogwallop!"
and many more at:
http://64.233.167.104/search?q=cache:rNIsYJiT85kJ:www.moviewavs.com/Movies/O_Brother_Where_Art_Thou.shtml+%22brother+where+art+thou%22+moral+fiber&hl=en