Holders Arsenal concede four as they are knocked out by Forest
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Nottingham Forest 4-2 Arsenal
Danny Welbeck briefly put Arsenal back in the game, following a fumble from Forest keeper Jordan Smith.
You can watch again below, although Smith might not be too keen to see this one again.
Nottingham Forest 4-2 Arsenal
Let's have a look again at some of those goals in the second half..
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Jamie, Plymouth: Arsenal need a fresh start, Wenger needs to leave for the sake of the club, Özil & Sanchez will undoubtedly leave too. Wipe the slate clean & trust in youngsters - the academy products can do it!
Peter Nightingale, Herts: Going to play Wenger Excuse Bingo before his interview.
Philip Anastasi: Usually we wait until Feb for the annual Arsenal meltdown - is Arsene bringing it forward as it's a world cup year?
Nottingham Forest 4-2 Arsenal
As expected, television personality, and Arsenal fan, Piers Morgan is not too impressed with his side.
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Nottingham Forest 4-2 Arsenal
Conor McNamara
BBC Radio 5 live commentator
This Arsenal team has been good enough in the past but this does show the deterioration of the club.
They have lost the ability to turn up and beat a team from a lower league and don't forget, Forest were not at full strength either.
This was simply a day where Nottingham Forest wanted it more.
Nottingham Forest 4-2 Arsenal
Where next for Arsenal? They may well be playing as strong a team as possible in their two legs against Chelsea in the Carabao Cup semi-final. The first of those matches is at Stamford Bridge on Wednesday.
The Gunners have no chance of winning the Premier League and have just thrown away the defence of their FA Cup at the first opportunity.
Nottingham Forest 4-2 Arsenal
Leon Osman
Former Everton midfielder on Radio 5 live
Image source, Rex FeaturesPeople question the magic of the FA Cup. But we've seen it today.
Forest have been incredible to a man. They fought harder and they deserve their win today.
The Arsenal players are complaining to the referee but it doesn't matter as they were beaten before that second penalty.
Nottingham Forest 4-2 Arsenal
Christopher Lawrence: Hands down, the worst Arsenal performance I have seen. Ignore any excuses you may hear. Just awful.
James: Wenger will no doubt drag out his usual whinging about the referee. It can't disguise poor selection and a lack of leadership.
Jack Jenkins: The perfect cup game. Not stopped smiling. Proper bangers and mash FA cup game. Thank you Forest.
Nottingham Forest 4-2 Arsenal
The Arsenal players are furious with referee Jon Moss. Per Mertesacker is remonstrating with the referee, insisting that fourth goal - Kieran Dowell's penalty - should never have been given.
But let's not take anything from Nottingham Forest. They have been the better team, they deserve the victory and they got the victory.
Arsene Wenger's selection gamble backfires, in a spectacular way.
Nottingham Forest 4-2 Arsenal
Arsenal have not gone out in the third round of the FA Cup since 1996, when they lost to Sheffield United in a replay.
Now they have.
ARSENAL ARE OUT.
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Lee, Sheffield: Wenger has done a terrific job over the years but his Legacy is getting harmed with each passing year . You get what you deserve.
Jordan Baldock: To the Arsenal fans moaning about that penalty the fact is you don’t deserve to go through. Forest have well and truly done a job on you today.
Chris Faz: 100% double touch on the penalty.
Nottingham Forest 4-2 Arsenal
Chuba Akpom has a shot, it is saved by Jordan Smith, but Theo Walcott, one of the fastest players in the Premier League, just can't get a touch before it goes out of play. Agonizing for Arsenal.
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Matt Smith: As a Liverpool fan I'm definitely on board with #TeamArsene, external
Chris Carr: How long would the Wenger Out crowd give a new manager before they expected a trophy?
Felix, Nottingham: All these Arsenal fans blaming the team selection must not have seen the age of the Forest team
Nottingham Forest 4-2 Arsenal
Nottingham Forest 4-2 Arsenal
Leon Osman
Former Everton midfielder on Radio 5 live
I was just saying this game has had everything but a red card.
On the penalty:
From our point of view, it looked like Dowell had hit it with his front foot.
The referee spoke to his assistant and between them they gave the goal.
It was a big decision for Dowell to take the penalty and he has got a good bit of fortune.
Image source, ReutersNottingham Forest 4-2 Arsenal
Michael Owen and Chris Sutton have spoken...
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Nottingham Forest 4-2 Arsenal
A straight red card for Joe Worrall and Nottingham Forest are down to 10 men. It was a foul on Chuba Akpom.
Kieran Dowell (Nottingham Forest)
Arsene Wenger has been unhappy at penalties awarded against his side. He is not going to be happy with this controversy.
The Arsenal players say the penalty should not have stood, claiming Kieran Dowell touched it twice - kicking the ball against his standing leg - as he slipped while taking it.
Referee Jon Moss chats with the assistant, but the goal is given. Arsenal again are two behind.
Wait just a minute. Wait just a minute. The ball is in the net. But did Kieran Dowell touch the ball twice? He slipped as he took it.
Nottingham Forest 3-2 Arsenal
Debuchy on Traore. Penalty. The tackle is from behind, but did he get the ball?
It looks a penalty to me. Forest have a chance for a fourth. Debuchy and Ospina booked.