"Moonmelon (scientifically knows as asidus). This fruit grows in some parts of Japan and is known for its vibrant blue colour. This fruit's party trick is that it can switch flavours after you eat it. Everything sour will taste sweet, everything salty will taste bitter, and it gives water a strong orange-like taste! Say WHAT?" <-- While this is a fake, the very real Miracle Fruit actually does make sour things taste sweet.