It isn't possible. The "dark side" is a misnomer, it's no darker than the side toward us. It's just the side we never see, not because it's dark, but because the Moon is always in the way. This is also why the Moon that we do see always looks the same (the so-called "man in the moon"). Look up "lunation" on the astronomy picture of the day to get a very good look at this. All your confusion stems from the simple poor choice of the word "dark" in that expression.