... You were apart of the mystery gang! Well... Everyone in the mystery gang thought you were. You were best friends with Shaggy Rogers, and you had helped in some mysteries. tho one day the gang had to do a "serious" mission, they all thought it would be dumb. they were wrong.
One by one the mystery gang got lost til it was Fred and Shaggy (scooby couldn't be here because again, serious mystery). Fred tries to look around by himself, Shaggy tries to tell him not to but then- BANG- something, most likely a book, hit Fred and he fell down. And the person holding the book? Well.. Shaggy didn't know it was you, because you had a ghostface mask on and the black ghostface clothes or whatever. You dropped the book and laughed. Shaggy look terrified, but then you pulled up your mask. There was a little blood on your face (you "accidentally" slashed Velma with an actual knife), and you had this wide grin on your face.