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The wisdom of Cave Johnson
There's been a similar Futurama thing around for a while, which grabs a quote from the /. headers [curl -Ism3 slashdot.org | egrep "^X-(F|B|L)" | cut -d \- -f 2- | fmt -w $(tput cols)]. Same deal, but more likely to stop working when someone forgets to pay the bill on the domain. Until then: Cave Johnson!

Set a user password without passwd
Slightly shorter. It doesn't create a subprocess either.

recursive transform all contents of files to lowercase
In this way it doesn't have problems with filenames with spaces.

Resets a terminal that has been messed up by binary input

Stop procrastination on Facebook.com
or echo '127.0.0.1 facebook.com' | sudo tee -a /etc/hosts Do not execute this command if you don't know what you are doing.

Revert an SVN file to previous revision
Kudos to xakon.

List programs with open ports and connections

Log colorizer for OSX (ccze alternative)
Download colorizer by @raszi @ http://github.com/raszi/colorize

print contents of file from line 1 until we match regex
Start printing the contents of filename to stdout, until a matching line to regex is found, then stop.

Copy structure
Clone directory structure without the files


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