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.

Sentence 1: A black man with a green cap. Sentence 2: A man wears a cap.
The man has a red hat on.

Sentence 1: Two costumed women holding a poster entitled "prom night". Sentence 2: Two women are in costume.
'Anaconda' cosplayers are holding a giant snake at the convention.

Sentence 1: A crowd of people are in the streets and some have torches. Sentence 2: People have torches.

A woman is building a bird house.