Yip Gets Stuck

Yip and Yannika are playing in Yip's backyard.
They're playing tag. Around the apple tree.
They scream. And they shout at the top of their lungs.
"Tag, you're it," shouts Yannika. And she runs away.
Yip is just about to tag her back when all at once - what's that? He's caught on the tree. With his sweater.
He pulls and he tugs. A thread of his sweater is caught on the tree. And look, the thread is getting longer. And longer, and longer.
"Careful!" shouts Yannika. "Your sweater's coming undone."
But Yip thinks it's fun. He walks away. And every step he takes makes the thread get longer. He walks around the tree. And the thread goes round the tree as well.
"Look what you're doing," says Yannika. "You shouldn't do that."
But Yip can't stop laughing. He walks around and around and around, and the thread wraps around the tree. And his sweater gets shorter and shorter.