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 young man with no shirt on is wearing black pants and sneakers is jumping over a blue skateboard. Sentence 2: This young man is attempting the most difficult skateboarding trick known to man.
a man in black pants jumps over his skateboard

Sentence 1: A man cleans the windows of a tall building, suspended only by a rope. Sentence 2: A man cleans the windows of a tall building with a towel.
A man cleans the windows of a tall building.

Sentence 1: Two smiling people with dark hair. Sentence 2: Two people are happy and smiling at a joke.

Two people smile.