In parts of central Europe it's traditional to have something to drink BEFORE you go sit in the hunting stand. In Germany I heard this called "aiming fluid," which not only calms the nerves but dilates the pupils a little.
This is true. In Hungary it was palinka, which is basically an eau de vie. They let very ripe fruit ferment and then distill it. Pear and apricot are both very good. The trick is to use fruit with high fructose content and to not add any sugar.
Ah...good times. It was the first time I ever hunted at night. No lights, not night vision or anything like that. A herd of boar come out of the forest and the guide says "shoot the dark one". WTF? It's night time, they all look dark!