Boomerang effect

The boomerang effect occurs when an attempt to influence people leads them to adopt attitudes or behaviors opposite to those intended, often by provoking resistance.

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Psychological reactance: A motivational state arising when people perceive a threat to their freedom and seek to restore it. Perceived pressure can trigger resistance that reverses an influence attempt.
Public service announcement: A message broadcast to the public to inform or influence behavior on an issue of public concern. Health and safety announcements can provoke resistance when they seem to threaten autonomy.
Freedom of choice: The ability to select among alternatives without coercive restriction. Reactance depends on perceiving that a valued choice is being restricted.
Forbidden-fruit experiment: A line of experiments examining how restricting access can increase the appeal of a choice or object. Experimental restrictions demonstrate how threatened freedom can increase attraction.
Backfire effect: A broad label for cases in which an intervention or message produces an outcome opposite to its intended effect. It overlaps with boomerang effect but can describe other kinds of unintended reversal.
Persuasion: Communication intended to shape beliefs, attitudes, intentions, or behavior. The boomerang effect is a possible unintended outcome of persuasion.
Fear appeal: A persuasive message that uses threat or fear to motivate protective action. Strong threats can elicit denial or defiance instead of the intended protective response.
Attitude: A relatively enduring evaluation of a person, object, group, issue, or idea. A reversal in evaluation is one common form of the effect.
Romeo and Juliet effect: The proposed increase in romantic attachment when a couple faces opposition from parents or others. It is a relationship-specific proposed example of opposition intensifying the desired bond.
Persuasion resistance: The processes by which people reject, counter, or avoid persuasive messages. Resistance may block influence without producing an opposite attitude or behavior.