In this task, you're given a four sentences of story written in natural language. Your job is to complete end part of the story by predicting appropriate last sentence which is coherent with the given sentences.

Sentence1: Will and his sister loved to make mud pies in the summer. Sentence2: They would mix dirt with water, shape it and pretend it was real food. Sentence3: Then one day Will forgot it was pretend and bit into one of the pies. Sentence4: Mud oozed out of his mouth.
His sister couldn't stop laughing.