The variety and range of response here is already interesting (in the poll and comments).
Thanks for jumping in here.
I've tried it with both brandy and bourbon-whiskey and I like it both with and without alcohol depending on my mood.
The funny thing is, when I was very little I got sick soon after sipping a glass of egg nog... so for years I couldn't even stand to think about egg nog... because I associated it with getting sick. But, in my teenage years, I completely grew out of that association.
And, now it's one of my favorite holiday treats.
I tend to be a fan of old-fashioned... and now somewhat odd holiday foods (like egg nog, figgy pudding, plum pudding, etc.).