I am lame enough I actually looked it up:
Butterbeer
Butterbeer is the drink of choice for younger wizards. Harry is first presented with the beverage in Harry Potter and the Prisoner of Azkaban. Though marketed to children, it contains alcohol: it appears to cause no noticeable drunkenness on a thirteen-year-old human (though it creates the feeling of “warmth”), but is strong enough to cause drunkenness in a house-elf; presumably, in very large amounts, the same would apply to a human. In the sixth book, Harry wonders what Ron and Hermione might do at Professor Slughorn’s Christmas party “under the influence of Butterbeer”, indicating that it can lower inhibitions, though presumably in very large amounts. J. K. Rowling said in her interview to Bon Appetit magazine that she imagines it “to taste a little bit like less-sickly butterscotch”. Butterbeer can be served cold or hot but either way it has a warming effect.
[edit] Firewhiskey
Firewhiskey is a type of alcohol that wizards under the age of 17 aren’t allowed to drink. Ron wonders hopefully if he can get one (illegally) in the Hog’s Head, but Hermione won’t let him. He finally gets one in the Half Blood Prince.
Sheesh, that makes it sound like 3.2 beer, which is indeed a tool of the Devil.