Sports prankster Karl Power was up to his old tricks at Old Trafford during Saturday's Manchester United v Liverpool game.
Power's latest - and most ambitious jape - involved him and 11 mates re-enacting Liverpool keeper Jerzy Dudek's blunder against United at Anfield earlier this season.
The Pole was ridiculed when he let a header through his legs leaving striker Diego Forlan to score with a simple tap-in.
Power and his pals took to the pitch at Old Trafford, all in United kits - one wearing a Diego Forlan-style wig.
Another removed his shirt to reveal a goalkeepers' shirt underneath with Dudek's name on the back.
Power's "team" acted out Dudek's clanger and then ran over
to the corner flag to taunt Liverpool fans with their celebrations.
Manchester United are now investigating how Power and his pals made it onto the pitch.
Previous Power stunts have included managing to get himself in the United team picture taken before their Champions League final clash with Bayern Munich.
Power has also attempted to walk out to bat for England at Headingley, and danced the haka in front of the English rugby team in Rome.
He has also played on centre court at Wimbledon and celebrated on the podium after last year's F1 grand prix at Silverstone before winner Michael Schumacher arrived.
Ice hockey is a contact sport, but Toronto tough guy Tie Domi is facing legal action following a penalty box scuffle - with a fan.
A man who fell into the box at a Philadelphia game and tussled with Domi two years ago has begun legal action.
Domi has a daunting reputation
Christopher Falcone, 38, is suing Domi, the Maple Leafs, the NHL and Comcast-Spectacor Inc, which owns the Flyers and the First Union Center, where the game was played.
Enforcer Domi said: "To be honest, I thought it was an April Fool's joke.
"I don't really know much about it yet. I'll find out the details and deal with it."
The suit says Falcone was seated behind the penalty box when Domi was sent there during the game on 29 March, 2001.
According to the suit, Domi began spraying and taunting fans with his water bottle, and Falcone was drenched.
Falcone contends that he leaned on the glass to grab the bottle when the partition gave way and he fell in.
His lawyer, John P Williamson, said his client "got the heck beat out of him".
The suit also alleges that a linesman joined in the fray, and calls Comcast-Spectacor negligent for having a partition that gave way.
A Comcast-Spectacor spokesman declined comment, saying the
building's owners hadn't seen the suit.