Once there was a brother who always played pranks on his sister. One day his sister told him that they were going on vacation. But the brother didn't listen, as she was elder. He believed she was trying to prank him back. But the next day, when he woke, he saw everyone ready to go somewhere. When he asked his mom, she said, "We are going to go on vacation." But the boy was not ready and got scolded for that. 
Always believe in what elders say. 