xkcd !

Some of my favourite xkcd strips

http://xkcd.com/247/

So much for computer security!
http://xkcd.com/538/

Socially hopeless :)
http://xkcd.com/173/

Useless!
http://xkcd.com/55/

Life is NP-complete!
http://xkcd.com/287/


:-)