re: I still shake like a mofo when a big buck walks out.

That's the 70/30 split. Normally 70% of your body's blood is in your arms and legs. The other 30% resides in your torso. It's how your fingers and hands can be so intricate while working.

That adrenaline dump sucks all that blood back into your torso for your body's natural fight or flight reaction. Now only 30% of your blood is in your arms and legs. Hence the 70/30 split.

Less blood in arms and legs combined with the comedown of the adrenaline dump and we are shaking like leaves.