A Queens man pulled a bow and arrow on a FedEx worker after accusing the deliveryman of hitting on his girlfriend — by singing her a tune, cops said.

The bizarre encounter happened near 59th Avenue and Lawrence Street just after 11:45 a.m. Tuesday while the 38-year-old songbird was dropping off packages, cops said.

But his little ditty apparently enraged Alexander Carrior, 22, who accused the courier of trying to make a move on his girlfriend before running into his house to retrieve a bow and arrow and chasing him back to his truck, police said.

Carrior was charged with criminal possession of a weapon, menacing, reckless endangerment and harassment, according to police.

“Thanks to their quick response and use of precision policing, the suspect was apprehended, and this weapon was recovered,” the NYPD tweeted, showing the hunting bow and a few arrows.