Morty going into Anthony's room.
"Morty" is an imaginary giant turtle that Anthony befriends in Anthony's Friend.
The others believe that Anthony made Morty up to keep him out of trouble. The others later realize that Morty is real, but you can't see him.
Gallery
The Wiggles and Morty
The Wiggles, Dorothy and Morty
Anthony and Morty (visible)
Visible form of Morty entering Anthony's room