It's the Brandy, Stupid!
Here's a recipe from some food network foodie named Sarah Copeland.
"Eggnog has gotten a bad rap because people have only had the cooked method and it's a little sweet and thick and they then douse it with all this rum, which takes away from it's essence."
Spencernog recommends Pennsylvania Dutch Egg Nog, available at your local state store. Lot's of booze in it, brandy, rum and whiskey. 29.5 proof. It's umm, ummm good.