Jaze Kabia scores twice in shootout as Grimsby dump Manchester United out of Carabao Cup

Reuben Amorim will no doubt attempt to explain away this latest humiliation, but he will have his work cut out trying to do so despite his side fighting back from two goals down to force penalties.

SPOT ON: Jaze Kabia of Grimsby Town scores the team's twelfth penalty in the penalty shoot out. Pic: Shaun Botterill/Getty Images.

Grimsby 2 Manchester United 2

(Grimsby win 12-11 on penalties)

Manchester United couldn't do it on a filthy night in Cleethorpes as Ruben Amorim's increasingly abject reign stumbled to perhaps its defining result.

The Portuguese will no doubt attempt to explain away this latest humiliation, but he will have his work cut out trying to do so despite his side fighting back from two goals down to force penalties.

Andre Onana endured the kind of night that will have Gianluigi Donnarumma's agent expecting a flustered call from the Old Trafford recruitment department.

The hapless United keeper atoned by saving from Clark Oduor but that was as good as it got in a shootout where Irish trio Jaze Kabia, Darragh Burns (both twice) and Reece Staunton all scored.

In an 18-minute penalty lottery comprising 26 spot-kicks, Bryan Mbeumo's effort struck the bar to spark the mother of all pitch invasions from ecstatic home fans as they celebrated the mother of all cup upsets.

Town boss David Artell had challenged his charges to see this Carabao Cup tie not as the pinnacle of their career but as a platform to progress and they accepted that task with relish.

United were out-fought, out-run and out manoeuvred by modest opponents whose wonderful players permanently reserved their place in the club's cup giant-killing folklore.

Grimsby could even afford the luxury of leaving the prolific Cork-born former Cobh Rambler Kabia on the bench until the final 20 minutes.

It was an outcome that led to the resounding delivery of the ultimate insult in these parts as the chants rang out long and loud from home supporters towards Amorim's array of expensively assembled but utterly beaten troops: 'are you Scunthorpe in disguise?'

Charles Vernam and former United trainee Tyrell Warren scored the goals to help end 78 years of hurt since Grimsby's previous victory over United and deservedly seal a place in the third round.

Without the distraction of a European campaign after their trials and tribulations in the Premier League, a trip to the Lincolnshire coast is arguably as close as United will get to the continent this season.

Showing eight changes from the Premier League draw at Fulham, they were soon enduring anything but a comfortable evening against a side 56 places below them in the football foodchain - although it didn't show.

There was nothing fortunate about the two-goal lead Grimsby forged inside the first half-hour, they simply made the most of the gifts on offer from the hapless visitors - who have history for ineptitude at this stage having shipped four goals to MK Dons the last time they played at this stage of the competition a decade ago.

United had untold opportunities to prevent Town's 22nd minute opener which arrived thanks to a litany of defensive errors as County Meath-raised midfielder Burns was allowed all the time in the world to send over a left-footed cross from the right.

With defender Tyler Fredrickson daydreaming, the centre found Vernam in acres of space in the United box and the midfielder had time to take a touch before beating the hapless Onana at the goalkeeper's near post to spark bedlam in the stands.

Cameron Gardner thought he'd doubled the advantage soon after but the Scotland Under-21 international's close-range effort was correctly ruled out for handball in the wake of more defensive hesitancy from the rattled visitors.

Town needn't have worried. The second arrived on the half-hour thanks to another addition to the Onana blooper-reel.

Vernam turned provider, swinging over a cross from the left at a short corner and when the United keeper failed miserably to come through a crowd of players to punch clear the ball fell invitingly for Warren, who spent 12 years in United's academy system without getting near the first team, to poke the ball into an unguarded net.

As the heavens opened Amorim's side belatedly showed signs of life after a horror half-hour. Grimsby keeper Christy Pym was twice forced into smart saves by Benjamin Sesko, the first by a low angled drive, the second from a low close range header.

For context, the £74m the Old Trafford club paid for the Slovenian forward's services this month equates to 13 years of turnover for their League Two opponents.

Town should have killed the contest within five minutes of the restart when Kieran Green surged into the area before cutting an inviting pass back for Burns, whose close-range effort was blocked by Ayden Heaven.

Gardner then found the net off the inside of a post only to have the effort ruled out for offside, with replays suggesting the goal should have stood.

Mbeumo, one of three substitutes thrown on for the second half, started the comeback by finding the bottom corner with a low curling effort with 15 minutes left.

Harry Maguire headed United level from a corner two minutes from time before Sesko fired over from two yards to ensure a penalty shoot-out in which Grimsby held their nerve to secure a result that will be as famous for them as it will be infamous for Amorim.

Grimsby Town (4-1-4-1): Pym 9; Rodgers 8 (Staunton 80, 7), Warren 8, McJannet 8, Sweeney 8; McEachran 8 (Oduor 73, 6); Vernam 89 9 (Brown 64, 7), Green 8 (Turi 64, 7), Khouri 8, Burns 0; Gardner 8 (Kabia 73, 7). Booked: McJannet.

Manchester United (3-4-2-1): Onana 1; Fredricson 2 (Fernandez 46, 6), Maguire 7, Heaven 5 (Mount 64, 5); Dalot 4, Ugarte 3 (De Ligt 46, 5), Mainoo 5, Dorgu 3 (Mbeumo 46, 7); Amad 5 (Zirkzee 82, 5), Cunha 4; Sesko. Booked: Fredricson, Zirkzee.

Referee: Tony Harrington.