The latest in the Team Fortress 2 "Meet the" series introduces us to the Demoman. Out of all the videos released so far, I have to say this is my favorite one yet. There's nothing like listening to a drunken Scotsman yelling at you incoherently.
I'm actually surprised that more of these videos weren't released prior to the games release. In any case, be sure to check out the "Meet the" Heavy Weapons guy, Soldier and Engineer videos. And of course, read up on Reverend Anthony's guide on "How to not look like a idiot at Team Fortress 2".