The other day, whilst running the Unix command to check a filesystem, I wondered whether or not you could get a T-shirt with it on:
And it turned out that you certainly can. Obviously it's inspired by the French Connection UK line of clothing. I would really like to get one of these, but the obvious place to wear it would be to work, where people are actually likely to appreciate it, However, in the last couple of years I've got into the habit of wearing shirts to work (as I had to replace my increasingly worn and holey wardrobe) and any variation in this format would not only mean I'd have to go out and buy a whole load of new clothes, I'd also not get my money's worth for all the shirts I've bought.
However, when my current batch of clothes start to wear out, I might well switch to T-shirts. It turns out that there are loads to choose from - certainly enough for a week or two's worth. ThinkGeek has some good ones - I particularly like "There's no place like 127.0.0.1", and "cd /pub; more beer".
I don't know why all the sites that sell this kind of thing market it "for geeks", as I'm not one of those. Excuse me whilst I go and re-configure an X-server...