What is psychological reactance, often used in stories? Even that famous love story was influenced by it!

There is a comedy sketch where someone is told 'Don't push me! Don't push me!' before being pushed into a hot bath, and you can't help but laugh, right?
But in psychology, that is a very natural reaction.

For example, have you ever rebelled when your parents told you to do this or that,
or felt like you didn't want to follow a boss's orders?
It's not necessarily because you're in a rebellious phase or because your boss's instructions are wrong,
but you might find yourself resisting anyway.

Human beings have an instinct to 'want to make their own decisions.'
This is something everyone possesses, so it is completely natural.
When you are given an order, this instinct kicks in as if you feel your value is being denied by the other person.
This is called 'psychological reactance'.
It was named by the American psychologist Jack Brehm.

Psychological reactance, for example, applies perfectly to Shakespeare's Romeo and Juliet.

The story shows that the stronger the obstacles from family and society, the more the two are drawn to each other and the more their love burns, which is because psychological reactance is at work.
Since psychological reactance makes things more dramatic, it is a technique often used not only in novels but also in dramas and movies.

When you are on a diet and forbid yourself from eating sweets, you find yourself constantly eyeing cakes and snacks, or you end up unable to resist and eat them anyway, right?
That is also psychological reactance.