If someone makes me mad or drives stupid in traffic, I will often say (as most early KMC'ers know) "They're the next one against the wall when the revolution comes".
I'm also known to say (when I don't know what else to say in a horrific situation) "Meanwhile back at the ranch, Grandma is holding off the indians with a single shotgun".
In here I also say this a lot "I could tell you but then I'd have to kill you".
Also some of these I use frequently..
"Shit and two are eight"
"A little knowledge is a dangerous thing"
"Perhaps you should have a fried egg sandwich"
And of course the usual SW ones that I use constantly in everyday life.