Kinky Friedman would win easily, except he was doing it on purpose, so maybe that doesn't count...

There was a rumor, about a tumor
nestled at the base of his brain.
He was sittin' up there with his .36 magnum,
Laughing wildly as he bagged 'em.
Who are we to say the boy's insane?"

- "The Ballad of Charles Whitman"