You forgot to tell us why you chose yours.

Anyway, in my case;
Many years ago there was a Norwegian geek mag called Tekno, that doesn't exist any more. In one of their issues they had a guide to irc, and in the config screen they had put Batman as nick. So I figured, I can't go around calling myself Batman, that would just be lame. I did however, like the -man ending, and since all of this was on the Internet I put them together, subtracted net, and go Interman. Yay.

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