...and if you've never heard of it, read all the ones in the topic, then all the ones on the website, and then post your favourite xkcd comics.

www.xkcd.com

The first few are just sketches, so start at http://www.xkcd.com/12/ and read on. A good knowledege of obscure computing, science and maths facts as well as internet phenomena is recommended. The mouse-over text on every comic is the best part.

"IN UR REALITY"

"Hey, at least I ran out of staples."

"POST OFFICE SHOWDOWN"

That track ('Battle Without Honor or Humanity') -- like 'Ride of the Valkyries' -- improves *any* activity.

"SUBSTITUTE"

"YOU THINK THIS IS FUNNY?"

"LABYRINTH PUZZLE"

"And the whole setup is just a trap to capture escaping logicians. None of the doors actually lead out."

"LASER SCOPE"

"I wish I'd missed you then so I wouldn't be missing you now"

"PERSPECTIVE"

"I wonder what I was dreaming to prompt that. I hope it wasn't the Richard Stallman Cirque de Soleil thing again."

"COMICS FROM 5:30 A.M."

"The 8th panel is my favorite"

"SCIENCE"

"Bonus points if you can identify the science in question"

"RANDOM NUMBER"

"RFC 1149.5 specifies 4 as the standard IEEE-vetted random number."

"YOUR MOM"

"It's either 'your mom' jokes or me' 'Then I, like so many men before me, must reluctantly choose your mom."

"GOTO"

"Neal Stephenson thinks it's cute to name his labels 'dengo'"

See my sig. I'll add more later, but I have to run to class

Suddenly no one's heard of xkcd? Come on!

The one that got me into it:

The one that got all my friends into it:

I have more favorites since then, including some you posted above... but those were the first two, and so have a special place in my heart.