Peyton Manning Dresses Up As Santa, Gets Pelted W/ Snowballs From Ricky Watters

Peyton Manning got to experience the "classic Philly welcome" as Santa Claus ... 'cause after he put on the red suit, he was hilariously pelted with snowballs from Ricky Watters -- and Matt Millen!

The Hall of Fame QB became the sitting duck for the holiday episode of "Peyton's Places" show on ESPN, where he's riding a firetruck inside the Lincoln Financial Field ahead of the Eagles' Christmas game.

Watters -- who played running back for Philly for two seasons -- and Millen, a former linebacker and executive in the NFL, are in the stands booing Manning ... and start hitting him with snowballs.

"Boo!! You're a lousy Santa Claus!" Millen yelled while throwing bombers at Peyton.

Of course, this is a remake of the 1968 Vikings vs. Eagles game on Christmas ... where the Philly fans started throwing snowballs at Santa Claus during the halftime show due to their team's poor performance and season.

The guy who dressed up as Santa, then 20-year-old Frank Olivo, says he was hit with more than 100 snowballs during his appearance.

Mind you, Olivo was picked out from the stands to play the role by the Eagles entertainer director, since a snowstorm the previous night kept the original Santa actor from getting to the game.