Deapite knowing what they really say, I always read the follwing usernames differently in my head.
roasthemonaspit = 'roast the mona spit'
hendonturnstile26 = 'head on turnstile 26'
doctornovocalchords = 'doctor novocal records'
utm_usic = 'utm music'
yesiamaduck = 'yes i am is a duck' (probably the weirdest one. I don't know why I see it this way at all)
There are probably others too. Am I alone in this spooneristic/dyslexic/illiterate-like behaviour with usernames? I hope not. :(