In this task, you're given a pair of sentences, sentence 1 and sentence 2, that agree with each other. Your job is to alter sentence 2 so that the pair contradict each other. Generated sentences must be short, with less than 15 words. New information can be introduced. Avoid using pronouns to confuse the subject of the sentence.

[EX Q]: Sentence 1: A person wearing a hat and baggy pants is skateboarding on cement. Sentence 2: A human rides a skateboard.
[EX A]: An old man falls off a skateboard.

[EX Q]: Sentence 1: A group of people are repelling off of a building as a crowd watches on. Sentence 2: The crowd is watching a group of people repel off the buildings.
[EX A]: The group of people are in a marching band.

[EX Q]: Sentence 1: The skateboarder wearing a black t-shirt and black pants is in front of the red brick building. Sentence 2: The skateboarder is in front a building.
[EX A]:
The skateboarder is inside the building knocking on the door.