Sometimes you can read someone's username and know exactly who you're dealing with, and which word they're about to misspell in the comment they left.
Choosing a Username: The Most Important Decision of Your Life
You step blinking into the blinding white light. All is new and the opportunities are endless. The vast wilderness of the Internet lies stretched before you, beckoning you, enticing you with its untold possibilities. All that remains is a name, a handle, the very essence of definition for the blank slate that IS...you. It can not be overstated, the significance of this ac...oh, you've picked CockasarusRex...well, that's good too.