The guy is just unstable, but I guess hiding in an underground lair for three years can do that to a person…

WASHINGTON (Reuters) - Vice President Dick Cheney blurted out the “F word” at Democratic Sen. Patrick Leahy of Vermont during a heated exchange on the Senate floor, congressional aides said on Thursday.

The incident occurred on Tuesday in a terse discussion between the two that touched on politics, religion and money, with Cheney finally telling Leahy to “f— off” or “go f— yourself,” the aides said.

“I think he was just having a bad day,” Leahy was quoted as saying on CNN, which first reported the incident. “I was kind of shocked to hear that kind of language on the floor.”