The concept known as “The Myth of Boiling a Frog” suggests that by gradually increasing the temperature of the water, a frog will not notice and will ultimately be boiled alive. However, scientific evidence does not support this notion.

The boiling frog is an apologue describing a frog being slowly boiled alive. The premise is that if a frog is put suddenly into boiling water, it will jump out, but if the frog is put in tepid water which is then brought to a boil slowly, it will not perceive the danger and will be cooked to death.

It claims that frogs cannot sense a slow change in the temperature of the water around them. If you plunge them into boiling water they'll immediately jump out. But if you place them into room temperature water and slowly heat it to boiling, the frog won't notice and will slowly cook to death.

Goes something like this: If you tossed a frog into already-boiling water, it would leap out. But a frog placed into a pan of water with a low flame under it will slowly be boiled alive, the temperature change being too subtle for the frog to notice.

The urban myth is that if you put a live frog in cold water and gradually bring it to a boil, the frog will not notice the slow temperature change, so it will stay in the water as it boils to death. If, however, you put a frog straight into boiling water, it will jump straight out.