Definition: In this task, you will be given a short story. One sentence from the story is chosen. Consider the events that happen before that sentence, or are likely to have happened before it. Does any of them directly cause it, or simply make it possible? You should write your answer in the form " A >causes/enables> B". Try to use phrases and sentences from the story to compose your answer when possible.
Input: story: My son was nine when he figured out Santa Claus was not real. We were at a mall and I saw what he wanted for Xmas. I sent him to his mom and tried to buy the item. He saw me buying the toy and laughed. My son is an adult and likes to tell that story.
 selected sentence: He saw me buying the toy and laughed.

I buy the toy >Causes/Enables> My son sees me buy the toy