People routinely use metaphors instead of employing the principles of logic. For example, Alan Greenspan compares the economy to a speeding boat that needs to be eased into the dock to avoid a crash. Love is described as a "magnetic attraction," and freedom as a barefoot walk on the beach. Modern philosophers attempt to negate axioms by asserting that we are stuck in a "web of belief." This lecture explains the meaning and the proper use of metaphors. It shows the error of using them as a crutch for thinking, and identifies the harm that results from such misuse.