I laughed until I became a horse
1st girl: My horse is a pony
2nd girl: My horse is a princess
3rd girl: My horse is a unicorn
4th girl (whose horse is the Horse of Darkness and can turn into any horse except Shadowfax): MY horse is a Unicorn Princess!
(The Horse of Darkness is annoyed. The Horse of Darkness does not like being a Unicorn Princess!)