It's nice to ask someone out to a school dance.
Bob knows that his classmate doesn't have a date for the school dance, and he doesn't either.
Bob wants to decide whether not to ask his classmate to go to the school dance with him.
Bob decides to ask his classmate to the school dance, and they go together.
Bob decides not too invite his classmate to the school dance and just goes by himself.
Bob's classmate in overjoyed that they got a date for the school dance and has a great time there.
Bob's classmate doesn't attend the school dance and is ashamed that nobody asked her to go.