From MSNBC's News of the Weird:

Frankfurt University researchers, according to a January issue of New Scientist, found that ants living in bamboo stems in Malaysian rain forests keep their nests dry by drinking any water that seeps in, then exiting the nest, urinating, then returning to the nest, repeating the process over and over until the nest is dry. The researchers found that 2 milliliters of water in a nest caused a colony's ants to scurry back and forth until they had urinated 3,000 droplets outside. [New Scientist, 1-6-01]

Sounds like me after a few beers.