Given the task definition and input, reply with output. 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: I was six and it was Christmas and I'd already opened all my presents. Sentence2: Very happy, I kissed mom and dad and went upstairs to my bedroom. Sentence3: I got in my nice soft bed then remembered I'd forgotten something Sentence4: So I got out of bed to walk to the bathroom.
And then I'd swear, I saw mama kissing Santa Claus.