I had this one hung up on my cubical wall when I was doing phone tech support a few years ago

[Tech Support Cheat Sheet](http://xkcd.com/627/)

![Tech Support Cheat Sheet](http://imgs.xkcd.com/comics/tech_support_cheat_sheet.png "'Hey Megan, it's your father. How do I print out a flowchart?'")

EDIT:
Now that I was promoted to the dev team I have this one on my wall

![Compiling](http://imgs.xkcd.com/comics/compiling.png "'Are you stealing those LCDs?' 'Yeah, but I'm doing it while my code compiles.'")