"That knife is so dull you could ride it to California and not even scratch your ass." ...A maintenance guy in a factory I used to work at.
"When I was 18, I couldn't believe how stupid my father was. By the time I was 25, I was amazed how much he had learned." ...Samuel Clemens/Mark Twain, I'm sure I quoted it wrong but the idea is there.
Speaking of fathers, my Dad's fave was always "Wish in one hand and shit in the other, see which one fills up first." When I was being a jackass he'd threaten to knock me conscious.
"If I have to understand, don't bother to explain." ...on a bartender's t-shirt, I tipped him just for the shirt.
A different bartender once told me, "I don't drink in your bed, don't sleep on my bar!" To which I replied, "Baby, you can drink in my bed ANYtime." Oddly enough, she stopped serving me.
From "Full Metal Jacket" (a treasure trove of great quotes), my all-time personal favorite is "WHAT... THE... FUCK... IS THAT?!? A JELLY DONUT?!?" I use that at work all the time, no one knows what the hell I'm talking about
"Yes madam, I AM drunk... but tomorrow I shall be sober, and you will still be ugly." ...Winston Churchill
For those times when you're asked to make shit into satin, "OK, let's put some lipstick on this pig, maybe no one will notice."
From "The Young Ones": Viv is badly hungover, Rick tells him, "That'll teach you to mix your drinks" Viv replies, "I already KNOW how to mix my drinks, you poofter!"
"She looks so good walking away, I almost don't want her to come back." ...Dale from "King of the Hill"
"To call you 'childish' would be an insult to children everywhere!" ...Jamie Lee Curtis's character, "A Fish Called Wanda" I think.
"There are two kinds of people in this world, and you're not one of them." ...unknown
Couple beers short of a sixpack, etc. etc...
Just saw this one on Jerry Fisk's site: "This knife will slice a radish so thin it will not give you gas."