If Warren Gatlands side are looking for an omen this weekend in their quest for a Six Nations triumph against Ireland on Saturday and win a 12th Grand Slam, they can reflect on recent history.
These rare days in the Welsh capital on the final day of the tournament have generally proved an overwhelming success over the years.
Most occasions have been magical moments of celebration with Wales triumphing in front of their home crowd and sparking wild scenes.
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When Wales have needed to deliver on the final weekend with the Grand Slam at stake, they have tended to triumph.
There are always exceptions to the rule. In 1988 Wales had secured the Triple Crown but failed to win a tournament clean sweep on home soil when France defeated Bleddyn Bowens side 10-9.
That has been the glaring anomaly. BBC Sport Wales looks back at some of the memorable moments that have provided Grand Slam fever in Cardiff as Gatland attempts to become the first coach to win three tournament clean sweeps.
Wales survived Frances best display of the tournament to secure a third Grand Slam in eight years in a pulsating encounter.
Gatlands side were equal to the challenge and held their nerve under the pressure of great Welsh expectations. A dynamic defensive effort was typified by flanker Dan Lydiate being named man-of-the-tournament.
A minutes silence before kick-off paid tribute to former Wales and Lions number eight Mervyn Davies, who died two days before the game.
Davies had captained Wales for their 1976 Grand Slam and Wales said his achievements had given them extra motivation with a try from wing Alex Cuthbert and 11 points from Leigh Halfpennys boot sealing victory.
You look at guys like Conor Murray, Sexton, Ringrose, OMahoney, guys that werent in great form at the start of the tournament are now starting to come to the fore. I am sure the crowd will help Wales overcome that tiredness but its going to be a great game.
It capped a wonderful season where Wales had finished fourth in the 2011 World Cup in New Zealand before this Six Nations clean sweep.
Highlights included a George North inspired win in Dublin, followed by a man-of-the-match performance by Sam Warburton at Twickenham, where super-sub Scott Williams scored the match-winning try.
But as he prepares for the Calcutta Cup clash with Scotland at Twickenham later on the same afternoon, Jones has suggested that Wales are weary and vulnerable against the reviving Irish.
In Gatlands first season in charge, Wales completed their transformation from World Cup flops to secure their second Grand Slam in four years and send the nation into raptures.
In the Cardiff finale, an early 9-3 Wales lead was whittled away by France after Gavin Hensons sin-binning on the stroke of half-time.
But Shane Williams secured the crucial try on 60 minutes after pouncing on a loose ball, becoming Wales all-time top try scorer in the process. Flanker Martyn Williams added a second try late on to provoke the celebrations.
To say that Wales versus Ireland matches cause a little complication in the Ruddock household would be an understatement. For we are talking here of the Mike Ruddock who, in 2005, coached Wales to a grand slam, their first for 27 years and one secured with victory over Ireland on a joyous day in Cardiff.
Shane Williams was the man of the tournament with his dazzling tries which included a Triple Crown winning score against Ireland, while namesake Martyn was brought out of retirement to help inspire the side.
This Grand Slam came just six months after Wales had been dumped out of the World Cup by Fiji in Nantes which resulted in the sacking of Gareth Jenkins and prompted Gatlands appointment.
Perhaps the most euphoric day out of the lot as Wales celebrated their first Grand Slam since 1978 with an historic victory on a carnival Cardiff afternoon.
In the scorching sunshine, a big screen was installed in the centre of Cardiff as thousands lined the street. They were climbing trees to try and gain a glimpse while supermarkets ran out of alcohol.
The fans lucky enough to be inside the Millennium Stadium witnessed Mike Ruddocks side hold their nerve to beat Ireland at home for the first time since 1983 and clinch the Six Nations.
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A first-half try from Gethin Jenkins helped Wales to a 16-6 interval lead with the prop charging down a Ronan OGara kick and deftly dribbling the ball over the line before triumphantly flopping on it.
Kevin Morgans iconic try and 16 points from Stephen Jones sealed the victory to complete a remarkable transformation in fortunes.
Two years earlier, Wales failed to win a match in the tournament, but under Ruddock they flourished by reverting to the adventurous style of old. Ruddocks son Rhys now plays for Ireland.
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Both teams were going for the Grand Slam with Wales having secured a third successive Triple Crown at Lansdowne Road two weeks before.
The iconic Grand Slam film, starring Windsor Davies, was aired for the first time on BBC the night before the game. A sure sign of impending success.
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Fly-half Phil Bennett had pulled out on the Wednesday with foot trouble, but was persuaded to change his mind. It was just as well, as the Wales captain scored two tries in a 16-7 Slam-sealing victory.
It proved to be Bennetts last Five Nations match alongside his legendary half-back partner Sir Gareth Edwards who bowed out in style with a drop-goal.
Once again, with a Triple Crown under their belt, Wales looked to have built up a winning 19-9 lead against France with a try from JJ Williams and penalties from Phil Bennett, Steve Fenwick and Allan Martin.
France battled back though and Wales were later indebted to a famous late try-saving tackle from full-back JPR Williams.
The decisive moment came in the final minutes as powerful wing Jean-Francois Gourdon charged down the right wing with only JPR between him and the line.
The fearsome full-back shoulder charged Gourdon into touch and stood with his fists raised as the crowd erupted and Wales sealed their Grand Slam.
Today the “tackle” would be considered an illegal challenge, a penalty try and yellow card. In 1976 it was a championship-winning intervention.