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 man riding a brown horse poses in front of a mountain scene. Sentence 2: A man is on a horse in front of some mountains.
A man is riding a polar bear.

Sentence 1: During the election party not all the guest attending are happy. Sentence 2: Some of the guests at the party are unhappy.
A boy plays with barbie dolls in his bedroom

Sentence 1: Several male students trying out for gymnastics hoping to make the team. Sentence 2: Men attempt gymnastics, hopeful.

Male students are perfectly stationary and emotionless.