In Spongebob's house, get enough shiny objects to get into his attic then Bubble Bash the button near the floating Tikis. A beach ball will appear. Move the ball to the button near the door. Get on the ball, double jump, and hit the button. Then, Bubble Bounce the button on the floor. Jump on the trampoline that appears. The sock will be on one of the platforms up on the higher shelves.
