My favorite quote.

What's yours?

[macrost]

"As a man, I had no choice. I took off my shoe and beat him to death. Each time my non-marking vulcanized rubber outsole struck his rapidly softening melon, I growled through clenched teeth the name of a different Kurt Russell character that deserved respect."

[rcjordan]

"Revenge is a dish best served cold."

<added>
2nd place:

Never fight a man with nothing to lose.

[Visi]

Experience is something you don't get until just after you needed it.

or

Hard work has a future payoff. Laziness pays off now

[pmac]

"If you want to get yourself out of a hole, it's best to quit digging."

[digitalghost]

Nemo Me Impune Lacessit

[2oddSox]

"Would you like fries with that?"

[Robert Charlton]

"Forgive me. I didn't have time to write a shorter letter."

[georgeek]

Heisenberg might have slept here.

[ukgimp]

I feel sorry for people who don't drink. When they wake up in the morning, that's as good as they're going to feel all day.

Frank Sinatra

[deejay]

Frequently used at work:

"I can't decide whether to laugh or cry... so I shall laugh, with just a touch of hysteria"

"don't push me.. I'm running out of imaginary 'happy places'"

[diggle]

No man is an island.
Except when he's in the bath.

[lazerzubb]

Imagination rules the World ~Napoleon Bonaparte

Many that live deserve death. And some that die deserve life. Can you give it to them? Then do not be too eager to deal out death in judgment. For even the very wise cannot see all ends. ~ J.R.R Tolkien

[Marketing Guy]

"Writing good content is easy. All you need to do is stare at a piece of paper until a drop of blood forms on your forehead."

Scott :)

[Hagstrom]

never attribute to malice what can be adequately explained by stupidity

[DonRoss]

Outside of a dog, a book is man's best friend.
Inside of a dog it's too dark to read.

—Groucho Marx.

[Wired Suzanne]

Better than nothing

[Monkscuba]

Groucho again:

I wouldn't be a member of a club that would have me as a member

[Skylo]

"you know the world is backwards when the best golfer is black, the best rapper is white and the germans don't want to go to war"

and

"It's better to regret something you did than something you didn't do"

[Receptional Andy]

Probably not my favourite but still:

He has all the virtues I dislike and none of the vices I admire. - Winston Churchill

[Alternative Future]

It's Nice to be Important, But it's more Important to be Nice!

-gs

[brotherhood of LAN]

constipation is a thief of time, but diarhhoea will wait for no man.

M.Pringle.

[edit_g]

Ahem...

Don't eat the yellow snow.

Frank Zappa

[creative craig]

Better to remain quiet and seem a fool than to open your mouth and erase all doubt.

Craig

[limbo]

Peace cannot be achieved through violence, it can only be attained through understanding.

Albert Einstein (1879-1955)

- and something a little less topical :)

To alcohol! The cause of and solution to all of life's problems.

Homer J Simpson

[Susanne]

Fates guide him who will, him who won't they drag.

[ppg]

Can I have 2?

1. "I do not want my house to be walled in on all sides and my windows to be stuffed. I want the cultures of all lands to blow about my house as freely as possible. But I refuse to be blown off my feet by any."
- Mahatma Gandhi

2. "As stupid as someone who bought their stupid at a two for one sale."
- Neil Gaiman

[WildAngel]

i have 2

“There is no way to know before experiencing.”
-- Dr. Robert Anthony

“One sad thing about this world is that the acts that take the most out of you are usually the ones that people will never know about.”
-- Anne Tyler

Angel

[Staffa]

1. Don't take life too seriously, it's not permanent

2. Most people would rather die than think, in fact most people do. (Bertrand Russell)

[lawman]

My favorite as seen on a bumper sticker (posted many times already):

I Is A College Graduate

[Monkscuba]

For the Spanish speakers:

Seen on a taxi bumper in Colombia :

No soy ave, pero vuelo.

Seen inside another taxi in Colombia :

Mejor perder un minuto en la vida que la vida por un minuto