How do you score a homebunt?

Char: Here, read what happened in the Dbacks game today, this'll get you going.
Char: E. Aybar reached on bunt single to pitcher, E. Aybar to second on pitcher D. Davis' throwing error, E. Aybar scored on right fielder J. Upton's throwing error.
Char: INSIDE THE PARK HOMERUN.
Trinity: Yay!!!
Char: By a guy who was BUNTING!
Trinity: Wait.
Char: No, this is bad.
Trinity: Oops
Trinity: Boooooooo.
Char: BUNTING!
Char: HE WAS BUNTING!
Trinity: lmao.
Trinity: Homebunt!
Char: ok, lol.
Char: I am so glad i wasn't watching'we lost, 2-1.
Char: BECAUSE OF A BUNT!
Char: HE SCORED ON A BUNT!
Trinity: Homebunt!
Char: Heee.
Char: You're not appeciating my pain!
Trinity: But it's funny!
Char: It is funny.
Char: Why couldn't it have happened to the Dodgers?
Trinity: Because the universe is conspiring against the Dbacks, duh.
Char: Well, we have added another body to the DL.
Char: People are dropping faster than pitchers in the WBC.
Trinity: lmao!
Char: Eric Byrnes fractured his hand.
Trinity: Boo Byrnes.