Not quite one line and probably not my favourite, but I watched it recently and forgot how fantastic it is.
"You can start by wiping that ****ing dumb-ass smile off your rosey, ****ing, cheeks! And you can give me a ****ing automobile: a ****ing Datsun, a ****ing Toyota, a ****ing Mustang, a ****ing Buick! Four ****ing wheels and a seat!
Car Rental Agent: I really don't care for the way you're speaking to me.
And I really don't care for the way your company left me in the middle of ****ing nowhere with ****ing keys to a ****ing car that isn't ****ing there. And I really didn't care to ****ing walk, down a ****ing highway, and across a ****ing runway to get back here to have you smile in my ****ing face. I want a ****ing car RIGHT ****ING NOW!"