The first time I actually saw a deer while I was hunting in a tree -

It was a 140 class deer, I heard him jogging over a hilltop and before I knew it he was headed right for my tree! I was only up 12feet so I thought he could see me - I completely froze up.
I could have sworn (at the time) that he could hear my heart beating. My mouth was wide open and my heart was beating so hard that it was making a wierd croaking sound in my throat - I was so frozen up that I couldn't even close my mouth. I just stared at that monster buck while he walked right below me and proceeded to graze for what seemed like an eternity. Then he strolled away.

That was my first close encounter with a buck of any size - I've been HOOKED ever since!!!