The euphemism compares you to a frog in the following scenario: You put a frog into a pot of cold water. The frog is happy, splashing around in the pot, and having a grand time. You put the pot on the stove and turn on the burner on a low setting. The frog is still happy, swimming around, and content. He may not even notice the water becoming warmer. Maybe the slight warmth feels good. Now you turn up the heat. The water temperature rises, but it’s very slow, and so gradual that the frog doesn’t even notice. It’s kind of like watching a clock. The hands are moving, but it’s so slow, you don’t notice. But the heat is still being applied. The frog doesn’t realize what’s happening until it’s too late to escape. Now he’s frog soup. And this could be you. You’re frog soup.