Recently in Morning Wood a pub was built where they serve milk. There is a fun little pluggin that could make things interesting called
Mudders Milk. It makes milk give you drunk effects for a short while so your character stumbles around a bit and stuff like that. Here is the link

http://forums.bukkit.org/threads/fun-muddersmilk-v1-4-add-alcohol-to-your-milk-818.17015/

This is not a super major suggestion, but i have seen it working before and it is silly fun