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: 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 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.
The group of people are in a marching band.

Sentence 1: There may be a avalanche, lets grab some cocoa. Sentence 2: An avalanche may happen soon.

An avalanche may solve global warming.