A guitar was the weapon used during a street brawl in the Haight on Friday night, police said.
Two men “fought in the street over their relationship” at Waller and Cole Streets around 7:50 p.m., police said.
One of the men knocked his victim to the ground, beat him with the guitar, and kicked him, police said.
Cops knew the aggressor, a 30-year-old San Francisco man, and found him later at Haight and Belvedere streets.
He was charged with aggravated assault, police said.