It can be used as a variation of “:P”. Otherwise it’s a typo of “:D” There are other faces where capitalization matters a lot as well. “:l” (which varies slightly in look depending on the font its typed in) is mainly a blank face while “:L” is a drooling face.
It was an unconscious thing — we didn't mean to do it. We didn't just go up and say, "Now God, we’re gone." We had gone a whole day's journey and then we came to see that we had unconsciously ushered God out of the universe. A whole day's journey — didn't mean to do it. We just became so involved in things that we forgot about God.