By Jonathan Stevenson and Chris Bevan
It is unlikely that West Ham fans will ever forgive referee Keith Hackett for events at Villa Park on 14 April, 1991.
With 20 minutes gone of a lively FA Cup semi-final, Nottingham Forest winger Gary Crosby was bundled to the ground by West Ham defender Tony Gale.
To the astonishment of both sets of fans Gale was shown a straight red card by Hackett and the Hammers never recovered, losing 4-0 as Forest ran riot with their man advantage.
Hackett later revealed referees had been given fresh instruction from the FA a few days before the game to change the way they interpreted the laws about the professional foul.
But whatever the mandate, the game was ruined. BBC Sport finds out what happened to the West Ham players on the wrong end of that infamous decision.
Manager - Billy Bonds 'Bonzo' is a West Ham legend who played a record 757 games for the club from 1967 to 1988, had two testimonials, and was manager from 1990 to 1994.
Since resigning as boss in the summer of 1994 he has managed Millwall from 1997-98, coached at Reading and worked as a radio pundit and after-dinner speaker.
Ludek Miklosko The popular Czech made 372 appearances for the Hammers before a three-year spell at QPR. Back with the Hammers now as the club's goalkeeping coach.
Steve Potts Hammers stalwart who played 505 games in 19 years at the club before leaving in 2002 for a season with Dagenham & Redbridge. Still pulls on a claret and blue shirt when he turns out for the Hammers' Masters side.
Chris Hughton Ended his career due to injury in 1993 to begin a coaching career at Spurs, where he became assistant manager in 2001. Still number two, currently to Martin Jol.
Tony Gale The victim of the day, Gale was a loyal Hammers servant from 1984-94. He picked up a Premiership winners' medal with Blackburn in 1995 and now works as a TV and radio pundit.
Colin Foster Giant centre-half who spent five years at West Ham from 1989-94. Later played for Watford and Cambridge before hanging up his boots in 1998.
George Parris Left West Ham to sign for Birmingham in 1993 and went to on play for Brentford, Bristol City and Brighton too. Now a sports coach at the University of Sussex.
Martin Allen Saw out his career with Portsmouth and Southend before starting out coaching at Reading. Left to become Barnet boss, moving on to League One outfit Brentford in March 2004.
ON 14 APRIL 1991
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Twenty paintings worth $500m were stolen from the Van Gogh museum in Amsterdam - but were recovered an hour later.
Video gamers had a new hero in Sonic The Hedgehog
Ian Bishop After leaving the Hammers in 1998 'Bish' played for Manchester City, Miami Fusion, Barry Town, Radcliffe Borough and Burscough - where he was assistant manager to another former West Ham player Mike Marsh.
Bishop also briefly ran a pub in Southport but moved to America in 2004 when he took over as player-coach of New Orleans Shellshockers and is still in the US coaching youngsters at sports camps.
Kevin Keen The right-winger had spells at Wolves, Stoke and Macclesfield after leaving the Hammers in 1993. Returned to Upton Park in 2002 on the staff and is now reserve-team coach.
Stuart Slater Ended his playing days with Western-Super-Mare Town in 2003 after a spell in Australia. Plays for the Hammers' Masters team and has worked for the club's academy.
Trevor Morley Suffered a horrendous facial injury after leaving West Ham for Reading in 1995 but continued playing and moved to Norway in 1996 where he worked as Arsenal's Scandinavian scout and coached at Bergen Sparta.
Meanwhile, what became of the Forest group of the time?
Manager - Brian Clough The master gaffer only needed an FA Cup winners medal to complete his set. But an agonising 2-1 extra-time defeat in the 1991 final against Spurs was as close as he got.
Clough ended his wonderful 18-year spell as Forest manager in 1993 as the club were relegated from the Premier League and the 58-year-old was suffering from ill-health at the time.
In time he recovered, taking his rightful place in the public eye before his death from stomach cancer in September 2004 at the age of 69.
Mark Crossley 'Norm' enjoyed a 13-year spell on Trentside before leaving for Middlesbrough in 2000. Joined Fulham three years later and now, aged 36, is playing second fiddle to Antti Niemi.
Gary Charles Capped by England during a promising start to life as a professional footballer, Charles' career fell away amid problems with drinking and he was forced to retire with a knee injury at 32 in 2002.
Stuart Pearce Stayed with the club despite relegation in 1993 and captained England while playing second-tier football. Left in 1997 for Newcastle, became Manchester City boss in 2005.
Des Walker Walker left for Sampdoria in 1992, but came back to England a year later to play for Sheffield Wednesday. Enjoyed a second spell with Forest from 2002 until 2004 and had a short-lived reign as coach under ex-boss Joe Kinnear.
Steve Chettle Stayed at Forest until 1999, by which time Nottingham-born Chettle had made over 500 appearances. Now runs a Soccer School for youngsters in his home city.
Gary Crosby Scorer of the second of the afternoon but left Forest in 1994 when Steve Stone took his right-wing berth. Became Nigel Clough's assistant at Burton before quitting in January 2005 to concentrate on business interests.
Ian Woan Unlucky not to win an England cap during a fine 10-year stint at the City Ground, which included some sensational strikes. Now youth team coach at Swindon Town.
Roy Keane What can you say? Left for a British record £3.75m in 1993 when Forest went down and won everything possible at Manchester United. Joined Celtic in January but could be set to hang up his boots.
Garry Parker Played for Leicester and Aston Villa after leaving Forest in 1991. Now a builder and still playing aged 40 for Kidlington FC in the Hellenic League as well as for Forest's Masters team.
Nigel Clough Scored over 100 goals for the club before joining Liverpool in 1993 after relegation. Had a spell back at Forest on loan in 1997 and became Burton boss in 1998. Heavily tipped to be new Forest boss.
Lee Glover A life-long West Ham fan, Glover enjoyed a nomadic career after failing to secure regular first-team football at Forest. Now player-manager with Southern Premier side Grantham.