Claudio Ranieri was sacked by Leicester on Thursday less than a year after he led the 5,000-1 rank outsiders to the Premier League title.
The Italian left the King Power Stadium with the club hovering just one point above the drop zone and in danger of becoming the first reigning champions to be relegated since Manchester City in 1938.
But a change of manager does not necessarily bring a change of fortune, as this season's managerial merry-go-round in the top two divisions shows.
PREMIER LEAGUE
** Only three other top-flight clubs - Swansea (twice), Crystal Palace and Hull - have changed managers this season.
** Swansea took 0.57 points per game under Francesco Guidolin and 0.73 under his replacement Bob Bradley, the pair leaving them 17th and 19th respectively in the table. They are now 15th after winning four of their first six league games under Paul Clement (2.00 PPG).
** Palace have declined from 0.88 PPG under Alan Pardew this season to 0.50 under Sam Allardyce, whose fortunes have not improved since losing his England job after one match. The Eagles have dropped from 17th to 19th after taking four points in eight games since his appointment.
** Mike Phelan was August's Premier League manager of the month but the honeymoon quickly ended and he left Hull bottom of the table with 13 points from 20 games (0.65 PPG). Marco Silva has started with seven in five (1.40) despite facing Chelsea, Manchester United, Liverpool and Arsenal in succession.
CHAMPIONSHIP
** Ten clubs - Aston Villa, Cardiff, Derby, Rotherham (twice), Wolves, Wigan, QPR, Birmingham, Nottingham Forest and Blackburn - have changed managers.
** Seven of the 11 new managers have improved their teams' points-per-game records, the exceptions being Birmingham boss Gianfranco Zola, Kenny Jackett at Rotherham and QPR's Ian Holloway.
** Birmingham were outside the play-off places on goal difference alone when they controversially sacked Gary Rowett and replaced him with Zola in December. Rowett's average of 1.62 PPG this season was more than triple that of Zola, who has 0.5 PPG after taking just six points from his first 12 games in charge.
** Rotherham's three managers have each collected less than a point per game. They took six points from their first 13 games (0.46 PPG) under Alan Stubbs, one from five (0.20) in Jackett's brief reign and 10 from 15 so far (0.67) under Paul Warne.
** Holloway has collected as many points (20) as his predecessor Jimmy Floyd Hasselbaink but has overseen one more game, 17 to 16. Hasselbaink averaged 1.25 PPG before being sacked in November, with Holloway's Rs taking 1.18 PPG.
** Cardiff's Neil Warnock has more than doubled Paul Trollope's points-per-game total while Derby have significantly improved under Steve McClaren. Warnock has 1.68 PPG (37 from 22) to Paul Trollope's 0.73 while McClaren has 1.81 (38 from 21) to Nigel Pearson's 0.91.
** Roberto Di Matteo drew seven of his 11 league games in charge of Aston Villa, who have improved from 0.91 PPG to 1.24 since turning to Steve Bruce.
** The smallest impact can be seen at Wolves, who took 16 points in 14 games under Walter Zenga and 18 in the first 15 games of Paul Lambert's reign. Caretaker Rob Edwards oversaw a draw and a defeat in between times.
** Wigan have taken 0.88 PPG since Warren Joyce took charge, compared to 0.79 this season under Gary Caldwell.
** Gary Brazil has claimed nine points from seven games since taking over from Philippe Montanier (27 in 26) at Forest, while Tony Mowbray has yet to take charge of a match for Blackburn after replacing Owen Coyle as manager on Wednesday.
