In the 19 century, a few experiments were aimed at observing frogs’ reactions to slowly heated water.
They found that frogs tend to not jump out of the pan if the water was heated slowly but steady.
The frogs will get used to the water’s temperature. As soon as they do, the temperature increases slightly (and almost in a subtle way). When it increases, they get used to the new temperature…
…Until the water reaches the boiling point. That’s when the shit breaks loose!