I saw that one of the planned features is a randomly triggered region/sphere event that will animate corpses into undead creatures, so I thought: why not have a similar random event that will select a single (full) barrel of booze and animate the liquid into a booze elemental? The event will cause negative thoughts (of the "what a waste" variety) for dwarfs which haven't had a drink in a while, dwarfs for which that type of booze is their favorite, brewers, and the brewer which brewed that particular barrel (if all conditions are met for the same dwarf the cumulative effect might send them into a tantrum). Since dwarven booze is highly flammable you can fight the elemental by setting it on fire, but not only does this give it the chance to set other things on fire before it dies, but it isn't very dwarf-like. The dwarf-like way of fighting it is to dive into it head first and start guzzling with all your might. The elemental will eject the dwarf, who will dive back in again. This would probably be more amusing if the game tracked multiple levels of drunkenness, so that a just few dwarfs fighting it will get falling down drunk, and single dwarf fighting it will die of alcohol poisoning.
Another use for booze elementals: when magic is implemented, there can be a Summon Booze Elemental spell/skill, with booze elementals being the easiest type (or only type) of elemental for dwarfs to summon, because of their natural affinity for booze. When faced with a siege the dwarfs can turn a barrel of booze into an elemental, set it on fire, then send it against their enemies to set them on fire. And if used in a manner other than a walking Molotov cocktail, maybe the type of booze used could affect their stats and abilities somehow.