In this task, you're given a pair of sentences, sentence 1 and sentence 2, that neither agree with nor contradict each other. Your job is to alter sentence 2 so that the pair clearly 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.

Sentence 1: A man wearing a black leather vest with a rebel flag patch on it. Sentence 2: A man wearing a colorful scarf and a black leather vest with a rebel flag patch on it.
A person is wearing a vest.

Sentence 1: Two guys barbecuing, one in blue shirt bending down, while the other in black shorts stands facing his back to the camera. Sentence 2: Dinner is being prepared by the two brothers.
Two men are barbecuing.

Sentence 1: A man is watching his dog in his yard. Sentence 2: A man in a blue shirt is watching his dog.

A man and his dog in the yard.