What would you name a detective if he didn't already have a name?
Cassie.
Get it?
Detective Cassie
Explanation
Explain Bear
Listen up, nimrod! The joke is a play on words. If a detective doesn't have a name, you'd need to "case" it, meaning investigate or solve it. "Cassie" sounds like "case-y", get it? You probably don't because you are dumb.
Aiden
omg XDDDDDDDDDDD
Gwen
Thanks. I didn't think it was THAT funny!