Luigi Mangione Was Trolled Outside Courthouse With Super Mario Bros Line, on Video

When Luigi Mangione made his initial court appearance Tuesday in Pennsylvania after a nationwide manhunt finally ended a day earlier ... and along with his outburst at the cameras, came some trolling from onlookers.

Here's the deal ... Mangione was apprehended Monday at a Pennsylvania Mickey D's ... and hours later, the Manhattan D.A. charged him with murder in the brazen December 4 fatal shooting of Brian Thompson.

After his brief extradition hearing Tuesday ... Mangione was led out of the Blair County courthouse by police where a group of reporters and others screamed questions at him ... along with a very specifical taunt.

Someone in the crowd shouted out ... "Hey, Luigi! It's a me, Mario!" ... which of course is the famous phrase used by the video game character, very popular in the mid-'90s thanks to the Nintendo 64.

Mario Bros. memes flooded social media shortly after the suspect was named ... as supporters celebrated what they believed to be a heroic act.

Mangione has been charged with second-degree murder in New York in connection with the Dec. 4 shooting of insurance executive Brian Thompson. He also faces gun and forgery charges in Pennsylvania. He's currently fighting his extradition to New York.

Monday morning ... Mangione was busted in Altoona, Pennsylvania as he sat inside a McDonald's restaurant. A customer recognized Mangione from widely circulated wanted posters following Thompson's murder, and told an employee ... who then contacted local police. Officers responded and cuffed the suspect.

Authorities recovered the alleged pistol Mangione used in the murder and a 3-page manifesto he'd written railing against corporate America and the healthcare industry, according to police.