Vitaly Janelt’s quickfire double put Brentford on the brink of Premier League safety after their 4-1 rout of a Chelsea side beset by unrelenting takeover talk.
Christian Eriksen also netted in a win that puts Thomas Frank’s Brentford on the verge of cementing their top-flight status following a hugely impressive debut campaign.
Toni Rudiger hammered home a long-range strike to stun Stamford Bridge and hand Chelsea a 1-0 lead just after half-time.
But Brentford punished Chelsea’s out-of-character defensive disarray three times in six minutes to seal a memorable win for the Bees.
And by the time Yoane Wissa drilled home a fourth at the death, the travelling Brentford fans were in dreamland.
Chelsea’s fine run of six wins on the spin in all competitions came to a crashing halt in West London, with the Blues now looking over their shoulders in the league.
Fourth-placed Arsenal could cut their deficit on third-placed Chelsea to two points with a win at Crystal Palace on Monday.