I remember when switching from ICQ to Microsoft Messenger thinking "good riddance". Messenger employed the not the least bit novel approach of letting users sign in using a self selected textual screen name.
My god those were awesome. A great friend of mine typed in his name, Ben LastName. It said it was taken, but how about Ovenproof Ben? Mine was also taken, how about Mucous Robin? Both have stuck. Its name generator was fantastically random.
I can't believe I can remember mine as well (10407923). I don't even remember my old phone number that I had at the time, or the address of where I lived!