Our happy hour fact to amaze your drinking buddies with.

Scientists may have isolated the gene that is responsible for making usually peaceful people violent and aggressive when drunk.

David Goldman, of the National Institute on Alcohol Abuse and Alcoholism, got access to the DNA of violent criminals in Finland whose misdeeds were both spontaneous and purposeless. He found that many were carriers of a variant of the HTR2B gene, which regulates serotonin production.

Further testing of both mice and humans confirmed that those with this gene variant were more likely to engage in impulsive behavior. However, Goldman found that carriers of the HTR2B gene variant only seem to engage in violent impulsive behavior if they are male and have been drinking.

So this probably explains why your normally mild-mannered buddy angrily attacks newspaper boxes on the way home from the bar. (And why he's probably not going to stop doing such ridiculous things.)