UK Researchers Discover 'Excessive Drinking Gene'

No, this is not a joke. BioSpectrum reports that a team of scientists from Imperial College London have found a gene that regulates alchohol consumption. The gene can cause excessive drinking when faulty.
As reported in the market news:

The team introduced subtle mutations into the genetic code at random throughout the genome and tested mice for alcohol preference. The study led them to the discovery that the mice carrying this mutation were willing to work for the alcohol and continued to drink consistently more than normal mice over long periods of time. They consumed alcohol for almost 85 percent of their daily fluid intake.

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