All hail the powerful and sloppy.

Researchers have found that power changes people - even down to their eating habits. Someone in a position of power is most likely to chew with their mouths open and spew crumbs.

The same part of the frontal lobe that can change a person due to head trauma is affected when a person is put in charge. They become more impulsive and selfish.

Psychologist Dacher Keltner and his team at the University of California, Berkeley, conducted a "cookie monster study," which found the person in charge would take the last cookie and eat with the manners of Cookie Monster.

"Our lab studies find, if you give people a little bit of power, they look a little bit like those brain trauma patients," Keltner said on the video.