Well, it's got to be seen to be believed. Behold the coolest AD attribute!

The AD Drink Attribute

After seeing this, I had to do some googling. According to comments on Christian Weyer's blog this is an implementation of part of RFC1274, but I think that's someone at Microsoft having a bit of a lend. The only reference in that RFC that I can see to drink, is an example of how to request a new attribute.