I wonder if I could make this fit on the back of my business cards…. (Click on it to see the original full-sized at XKCD.)

Image from XKCD.com

When a foot doctor goes to his family reunion, he probably gets asked to diagnose someone’s scalp condition; and I always ask my tire expert brother-in-law about mechanical issues, figuring he’s more likely to have run into them before than I have.  So I suppose it’s only fair that “computer experts” get the same thing.  But if you ask me to fix your PC or diagnose a Windows error, be warned that I’ll be doing exactly what this flowchart says, while trying to look like I know what I’m doing.