Reverse psychology is a technique involving the assertion of a belief or behavior that is
opposite to the one desired, with the expectation that this approach will encourage the
subject of the persuasion to do what is actually desired. This technique relies on the
psychological phenomenon of reactance, in which a person has a negative emotional reaction
to being persuaded, and thus chooses the option which is being advocated against. This may
work especially well on a person who is resistant by nature, while direct requests work best
for people who are compliant. The one being manipulated is usually unaware of what is really
going on. (資料來源)