Andre Villas-Boas was sacked as Chelsea manager on Sunday in the aftermath of yet another lacklustre performance on Saturday, when the Blues crashed 1-0 at West Bromwich Albion.
Here we look at the five key results that brought an abrupt end to Villas-Boas's brief reign in west London:
Chelsea 3 Arsenal 5 (October 29, 2011)
The Blues conceded twice in the last five minutes as Arsenal, inspired by a Robin van Persie hat-trick, took the points despite trailing twice.
A pulsating London derby provided the first sign that Chelsea's defence was crumbling under Villas-Boas's demand for a high line, which exposed the creaking limbs of John Terry and company to attacks from speedy strikers.