Where did you get your username from? (some RotE-ish spoilers)

[Albertosaurus Rex]

Are you speaking out of personal experience?

My previous usernames include Qlberts (an unpronouncable variation on my last name) and CP, (Which is often too short, leading to names like "CP the [whatever strikes my fancy at the time]") which is short for Cool Paramite, which is the name I used on the first forum that I ever joined (Oddworld Forums - paramites are a species of creature from the Oddworld videogames). Other members regularly shortened my name to CP, so when I started joining other places, it seemed an obvious choice.