"Crazy with low prices on Wind-Brahmin. You buy one!"
I can't remember the exact line, but when you first approach Veronica with low Intelligence and she asks you about the BoS.
"I've heard they can shoot lasers out of their eyes!"
Boxcars' greeting when you have extremely low reputation with the Powder Gangers. I don't remember the exact thing, but it involves mucho f-bombs.
"Are you [censored] Kidding me?"
"First I get my legs smashed, then in walks the Powder Ganger's grim [censored] reaper. What the [censored] have you got against us, man?"