Oh yeah. Downloaded a brand spanking new (20030502) ISO of knoppix and started stunning my friends. I live in a commune, and I have successfully converted 4 out of 5 housemates to Linux. The 5th is one of those 'but my stuff works like it is now, and I can get (read pirate) all the stuff I need on Windows'. Half an hour of Knoppix, and he's hooked.
Also, I work at a University and have been fighting an uphill battle with our administration not to require documents done in Word (But it's the industry standard!). Now, I can show all these people first hand what a free OS looks like. And explain to them why it's not 'freeware'.
Must say -- liveCDs rock.