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: Three bicyclists riding down a steep course wearing helmets. Sentence 2: the bicyclists are being careful down the steep course.
The bicyclists are  wearing helmets.

Sentence 1: A group of people riding on a crowded bus. Sentence 2: The bus was full.
People were on the bus.

Sentence 1: Man in purple shirt falls off bulls head. Sentence 2: The man is wearing a pair of blue jeans.

A man falls off of a bull's head.