The wheel of fortune turns, making nonsense of the rush to judgment that sees so many managers sacked with indecent haste in an era when they are lucky to last two years.
A week ago Ole Gunnar Solskjaer was Cardiff's messiah and Sam Allardyce a prat after the novice Norwegian's first game in charge was a 2-1 "triumph" at Newcastle in the FA Cup, where "Big Sam" turned into "Effing Allardyce" with West Ham's 5-0 drubbing by Nottingham Forest. A few days later Cardiff are in the Premier League's bottom three for the first time this season and the Hammers are out of it after a well-merited 2-0 win against Solskjaer's new charges.
As the more sagacious judges tell us, managers are rarely as good as they are cracked up to be when they are winning, and not as bad in adversity. West Ham's performance at Cardiff rubbished all those phone-in cliches about Allardyce "losing the dressing room" and being "tactically naive". The players' spirit, individual and collective, was immense, overcoming the loss of their right-back Guy Demel with concussion after seven minutes and the dismissal of James Tomkins after 71.
Such was the team's strength of character and purpose that they scored their second goal with 10 men. For those of goodwill it was pleasing to see Allardyce gain respite from media-intensified pressure. He has had to deal with a spate of casualties that would test your local A&E, and always maintained that results would improve when his best players were fit.
That was the way of it on Saturday, when Tomkins was back after injury to bolster the defence and Carlton Cole and Andy Carroll were available to share the centre-forward's duties. To their credit the two Davids who own West Ham, Gold and Sullivan, have been staunch in Allardyce's support, and why not? This is a man who has been interviewed for the England job and whose record is a warning to those who want him out to be careful what they wish for.
When he left Bolton they were fifth in the Premier League and when Newcastle sacked him they had five managers in the next three years. Most telling of all, when Blackburn got rid of him they were mid-table in the Premier. He got West Ham promoted at the first time of asking and established them in a comfortable 10th place last season. Cut him some slack, he deserves it.
For Cardiff, the result was a hammer blow. Down in the relegation places, their next two league fixtures are against Manchester City and Manchester United, both away. Solskjaer talks a good game but had to admit he was "surprised" by his team's no-show in the first half.
The plan was to go hard at West Ham from the start in the belief that they might fold again if they conceded the first goal. It didn't happen and the new manager said: "We didn't have any energy or enthusiasm, we never got going. The second half was the way we want to play. Craig Bellamy came on and put everyone on the front foot."
By that stage Matt Taylor's ball over the top and a right-wing centre from Matt Jarvis had enabled Carlton Cole to sidefoot West Ham ahead with his third goal in his last five league appearances. Cardiff huffed and puffed in response but a top-notch save by Adrián at Fraizer Campbell's expense denied them equality and Mark Noble, the personification of dreadnought spirit, doubled the margin with a smart finish in added time.
On a day when the latest accounts revealed that the Welsh club were £118m in debt, having somehow lost another £30m in their promotion season, the chairman, Mehmet Dalman, was keen to offset the bad news and brought forward their latest signing.
After saying that there would be an announcement on Monday, Solskjaer suddenly reappeared and produced Mats Moller Daehli, an 18-year-old Norwegian wunderkind from the manager's old club, Molde.
Daehli had three years at the Manchester United academy and was their young player of the year in 2012, ahead of Adnan Januzaj. He had the chance to go back to Old Trafford but opted to join Cardiff, in the knowledge that they offer greater opportunity for a first-team breakthrough.
Solskjaer said: "Mats is an outstanding talent and good business for us. He won't be 19 until March but he has just made his debut for Norway, playing against Denmark and Scotland in November. He's an inside midfielder who really likes to get in between the lines and take people on. You look at [Samir] Nasri and [David] Silva and he's that type of player."
Solskjaer is also interested in signing Wilfried Zaha and Fábio da Silva on loan but said: "They are Manchester United players and I can't comment on other teams' players."
Man of the match Mark Noble (West Ham United)