Note: all quotes are made by someone else than me. I have nothing to do with these texts, and they don't necessarily reflect my views of the world. The inventors of the quotes have all copyrights, but because the texts I have copied from walls and doors of toilets are written to places where they shouldn't be, the writers of these texts probably don't have any rights to their texts, and they wouldn't probably even want to. Some of these texts I have edited a bit in order to not have to write their clarifying (but long) beginnings, and to make the texts easier to understand.

There are also Finnish quotes, which I haven't translated.

From the toilets of the University of Helsinki

To do is to be. – Socrates
To be is to do. – Sartre
Do be do be do. – Sinatra

This paper is like John Wayne: it's rough, it's tough, and it don't take no shit!

(In the door:) Toilet tennis: look right.
(the right wall:) Look left.
(the left wall:) Look right.

From the web

I am taken aback to remember when a word processor was its own machine, when software – and even the OS – ran off of floppy disks, when a computer didn't boot – it turned on, and when a monitor that looked as good as a TV was a big deal. But I'm truly looking forward to the time when I will be surprised to remember when a computer was its own machine, when software – and even the OS – was run off of a hard drive, when a computer didn't turn on – it booted, and when a TV and a monitor were two different things!
[Kris Shaffer, http://www.osnews.com/story.php?news_id=10096&page=2]

From TV

If they'd be in the water, they would be dead. They'd be dead, I'd know about it. They're not dead.
[Special Agent Leroy Jethro Gibbs, NCIS: Naval Criminal Investigative Service]

Only fools are sure of anything. A wise man keeps on guessing.
[MacGyver: Angus MacGyver tells his son that Harry MacGyver (Angus's grandfather) used to say this.]

I quit drinking, which was really hard, because I'm not a quitter.
[Freddie Prinze Jr., Late Night with Conan O'Brien]

Correct. Dinner Out is a go.
[Spy Game: Nathan Muir tells commander Wiley to carry out Operation Dinner Out, but the CIA guys in the room think it's his wife on the phone.]

Why is Bush so sure there are weapons of mass destruction in Iraq?
– He's got the receipt.
[Chappelle's Show]

C'mon, I wanna show you the house. And I wanna see my mother's face when she sees you in it.
[Marissa to Ryan, The O.C.]