Ex-quarterback HARMON finally gets payback for UCLA gridiron sacking!

IF THIS DON’T MAKE YA SMILE, CHECK YOUR PULSE! “NCIS” star MARK HARMON was taken aback when a grungy, homeless-looking guy approached him during location shooting at the Barclay Hotel in downtown LA and said: “I don’t know if you remember me, but I used to kick your ass!”

The film crew tensed a second until Mark – after giving the guy a closer look – immediately started laughing!

Turns out that when he’d quarterbacked UCLA’s football team, this guy had played against him – and damned effectively!

“Yeah, I remember you…you sacked me good,” howled Mark as the two started chatting about old times – and hard times the guy had fallen on.

Learning his old rival had recently lost his job and was living in a shelter, Mark sat him down for a meal at the crafts table.

Said an on-set source: “They reminisced about their football days, but when it was time to go back to work, Mark excused himself for a couple of minutes.

"Then he came back and told the guy he’d arranged for him to work as an extra for the next four or five days they’d be filming downtown – and they walked onto the set together smiling.”