Clue.
"I typed the password as "scooby" in lowercase, and it worked just fine since usernames are usually case-insensitive."
Alternative letter-case form of Scooby
Scooby-Doo, a fictional cowardly anthropomorphic dog in a children's cartoon; used to make phrases bringing to mind aspects of that cartoon.
"The kids were so nervous about the haunted house party that they started calling each other "Scooby" and saying "Zoinks!" before running inside."