What are the best examples of reverse psychology?

Emily has a friend who has a reputation for not helping others. There is a concert they want to attend, but Emily’s mother has a list of chores that need to be done first. Emily gets to work, but her friend sits on the couch and turns on the TV. “Fine,” Emily tells her friend. “Don’t bother helping. See if I care about going to the concert.” This causes her friend to start helping.