Life's but a walking shadow, a poor player that struts and frets his hour upon the stage, and then is heard no more. It is a tale told by an idiot, full of sound and fury, signifying nothing. [William Shakespeare, "Macbeth"]
Aw, SHUT UP, Captain Bringdown! [Homer Simpson]
Bumper Stickers.
"Don't like my driving? Call 1-800-EAT-SHIT"
An oldie but a goodie :-)