October 3, 2007, is a date that Celtic fans will never forget.Celtic welcomed a legendary AC Milan side to Scotland that day for their Champions League group stage clash.The Italian giants were arguably the best team in the world at the time.They had won Europe's premier cup competition just months before as they defeated Liverpool in the final.With world-class players including Kaka, Clarence Seedorf and Andrea Pirlo, Carlo Ancelotti's side were expected to dismantle the Scottish outfit.But it was Celtic who emerged victorious in a historic day at Celtic Park.Stephen McManus netted the opener just after the hour-mark, only for Kaka to level the scores from the penalty spot eight minutes later.It was the home side who won it with one minute of normal time remaining through Scott McDonald.The Australian's winner sparked scenes of pure madness inside the stadium.One Celtic supporter, Robert McHendry, took his celebrations too far as he made his way onto the pitch to celebrate with the players.Running across the pitch, McHendry goaded Dida by tapping him in the face.Dida walked a few paces to confront McHendry but then bizarrely fell to the ground in 'agony'.The Brazilian was down for some minutes before leaving the pitch on a stretcher. Watch the moment below:

Celtic were charged £25,000 for failing to keep the fan off the pitch. McHendry was given a lifetime ban.

Dida, meanwhile, was also punished.

His theatrics were so bizarre that he was handed a two-match ban for breaching rules concerning "loyalty, integrity and sportsmanship".

Ranking football's ultimate GOATS on The Football Terrace! Messi, Ronaldo, Zidane, R9... Who is the greatest of all time?!

The punishment enraged the Italian club.

“It seems like a very, very unbalanced sentence,” Leandro Cantamessa, Milan's club lawyer, told Italian media, per Reuters.

“Dida has become the protagonist of the episode while the protagonist is another. This is not correct from my point of view of logic.”

Dida's ban was later reduced to one game. Play-acting really did reach its peak on that night at Celtic Park.