Premium single malt Scotch whiskey. Some of my best ideas have come to me while drinking Scotch.
Nota bene, some of my worst ideas have come to me when drinking Scotch.
+1 if by myself or w/ a buddy. But beers if it's a group hacking session. A group of us meet every Wednesday night and we rotate who comes up with the challenge of the night.
Perhaps a good idea for a Ask HN would be WHO do you drink with.