Slippery

Jimmy held on to the reins for dear life, and thought that a horse was about the most slippery creature to sit on that he had ever met. He slithered first one way and then another, and at last he slid off altogether and landed with a bump on the ground. Sticky Stanley and Lotta held on to one another and laughed till the tears ran down their faces. They thought it was the funniest sight in the world to see poor Jimmy slipping about on the solemn, cantering horse.
Author: Enid Blyton