LOL I'm an longtime bartender who experimented quite a bit on herself (do not try an irish flag, ever - ick - pretty, but it sucks - I had some gagging customers ...), I have a lot of favorites and non favorites - but must say with a soda mix I'd do a Birch Beer (clear root beer with a SNAP - from PA) and a whiskey. I get the birch beer from Williamsport area - love it.
that reminds me when i was bartending in new orleans, we had a generic red bull on the soda gun. if you look at a soda gun (at a bar) it's just one nozzle squirting syrup with several nozzles squirting soda water. so... i would block the soda water and pour just pure red bull energy drink (the syrup concentrate) into shots and dare customers to drink it.
a shot was the equivalent of like 3 red bulls straight to your dome. also, that much sugar gives you gut rot pretty bad.