As a mouse ran over a sleeping lion, the lion awoke and grabbed her.
"Let me go, please!" squeaked the mouse. "I'll repay your kindness, I promise!"
"What could you ever do for me?" scoffed the lion. "I'm letting you go only because it's not worth my time to kill you."
A few days later, the lion was caught in a hunter's snare. He roared in terror, and the little mouse ran to the rescue, gnawing through the ropes and freeing the lion.
"I was wrong about you," said the grateful lion. "You're a good friend to have after all."
Inspired by: Mille Fabulae et Una, a collection of Latin fables that I've edited, free to read online. I am not translating the Latin here; instead, I am just telling a 100-word version of the fable.
Notes: This is fable 208 in the book, which is Perry 150.