Jon Stewart‘s got a message for sports gamblers … don’t do it — or don’t lose, at least — because it forced him to get decked out in Philadelphia Eagles gear, pissing off his hometown crowd in Madison Square Garden.

Jon was rocking Eagles green from head to toe — even had a bucket lid — Saturday night at MSG, where he was watching his Knicks take on the Lakers. Normally, Jon’s a beloved Knicks faithful, but some boos rained down on him … due to his wardrobe.

He can thank Knicks star Jalen Brunson for all this — they bet on last month’s Eagles-Giants game, and since the G-Men came up short, Jon had to pay up … in a Saquon Barkley jersey, no less! Jalen made sure to come over and compliment Jon’s fit. 😂

It was a much different game night experience for Amy Schumer … who got tons of applause for her stint with the famed Knicks City Dancers.

They pulled her out of the crowd, and Amy pretended it was spontaneous … but the way she nailed the whole routine made it clear this was pre-planned. The crowd still loved it.

So, Amy gets the thrill of victory, and Jon … the agony of defeat.