No good deed goes unpunished.
A Good Samaritan, who tried to intervene during a domestic dispute on a subway on the Upper East Side yesterday, wound up pepper spraying a brute — and the rest of a subway car — after he got punched in the face, police said.
A couple got into a heated argument on an uptown No. 6 train at the 96th Street station at around 4 p.m., and someone alerted the cops of the fight, police said.
That’s when the fellow straphanger took matters into his own hands.
He tried to break things up only to get sucker-punched in the face by the hotheaded man, cops said.
The Samaritan then defended himself by pepper spraying his attacker — and wound up spreading the noxious fumes throughout the subway car, cops said.
Authorities evacuated the train.
After the air cleared a short time later, passengers were allowed back on.
Three passengers, who were overcome by the spray, were taken to St. Lukes Hospital and Lenox Hill Hospital to be treated for minor injuries, police said.
During the chaos, the couple who had been fighting slipped out of the train before police arrived.
Cops are looking for the unknown attacker in connection with the assault.
No arrests had been made as of last night.
Police did not charge the do-gooder for releasing the pepper spray on the train.