One of my favorite forms of intimacy is trusting each other enough to be able to turn your filter off and say the things you are thinking with judgment or shock.
You know that you have found someone very very special when you don't have to explain why you feel the way you do... they get it. Just as you get them.
This can be shared with a love, or friend, or family member. It's something that I cherish, being able to let the walls down.