We used to depend on our five basic senses, and quite forgot that they can sometimes lie: the different parts of the brain together form our perception of reality, but often it goes against common sense.
1. Your eyes can make you hear the words
When you hear someone say, all seemingly quite simple: the mouth of another person creates a sound that your ears hear. It seems that this scheme works well, what could possibly go wrong?
In fact, your eyes can deceive you: sight in most people is the dominant sense, which means that sometimes it is the eye determine what your ears hear.