Handymen:
The monster chases Shaggy and Scooby, so they go into a room. The monster enters and sees two familiar looking handymen. "Hi, like, we're the new handymen!"
"We'll fix things up…"
The monster then beats them up, for it can see Shaggy and Scooby in those disguises…
However, it turns out they're just two normal handymen that just look like Shaggy and Scooby. "Like, who are those guys," asks Shaggy.
"I don't know, but they sure are ugly," says Scooby. The two then leave.
The End