Imagine that you are being wheeled in to a hospital with a severe medical issue. As you are placed on a hospital bed, the doctors and nurses examine you and try to do everything they can in this stressful moment to figure out the best course of treatment. Eventually, they figure it out. They need to give you a certain substance via an IV bag. So one of the nurses leaves the room and rushes to go find your medicine.
When the nurse returns, they hook up the IV bag and you start to feel at ease knowing that you will be better soon. There's just one problem: the nurse grabbed the wrong IV bag and you aren't receiving the medicine you need. In fact, within an hour, you start feeling much worse.