A beer bottle was thrown from the crowd towards PSG's former United winger Angel Di Maria in the second half of the last-16 first leg, with the Argentinian responding by picking it up and seemingly pretending to take a swig from it.
Di Maria stayed down for an extended period of time while players argued with each other and complained to the referee Daniele Orsato. With the ball rolling out for a throw-in, Ashley Young barged into his back, sending him flying into the hoardings via the steep slope that frames Old Trafford's pitch.
Despite his starring performance, Di Maria was fortunate not to get injured when Ashley Young pushed him off the pitch and into a metal barrier before half-time - a move that drew criticism from PSG coach Thomas Tuchel after the game.
During the game, Di Maria, who used to play for United, was noticeably booed by the home fans.
Odell Beckham Jr. spotted at Gervonta Davis-Hugo Ruiz fight
It was an impressive though expected win for Davis, who needed two attempts Friday to hit the 130-pound super featherweight limit. Davis has had a troubled career to date under the tutelage of Mayweather and his self-titled promotion arm.
After the break, his deep corner to the far post should have been dealt with better by Nemanja Matic, allowing Presnel Kimpembe to convert, but the assist for PSG's second was superb.
The gesture likely annoyed United fans who are still left disappointed by his below-average tenure at Old Trafford.
Then came the moment the Argentine had been waiting for.
He said: "It was hard from the opening minute but I knew this was going to happen". If you tease him, it does not make him weaker.
Madrid can win fourth straight Champions League, says Courtois
He's really competitive and that's why he's played this many games. "He has been, and remains, a fantastic captain". We have great memories of this stadium. "His adaptation has been very fast", Solari said.
The former Real Madrid man was woeful in the first-half at Old Trafford, with his major contribution to the match being shoved off the pitch by Ashely Young just before the break.
Di Maria was more reserved after the game, posting to Instagram: "Happy for a lovely victory".
The end of Di Maria and Van Gaal's relationship wasn't good.
Meghan Markle being harassed, like Princess Diana — George Clooney
Making them even busier, of course, is their baby who's due to join the royal fold around the end of March or early April. The unnamed confidantes told People Mr Markle responded with a request for a "father-daughter photo shoot".