Chelsea were turned over by WBA 3-0 tonight as Cesc Fabregas's petulance saw him red-carded.
Jose Mourinho blooded Rubén Loftus-Cheek with his first start and 18-year-old Izzy Brown got some minutes for his debut.
The only Chelsea side to rock up at the Hawthorns were the Chelsea fans who never stopped chanting and cheering in their side throughout the 90 minutes.
Thibaut Courtois was called into and made a fine save on five minutes, deflecting away a near post, angled shot.
A minute later and Myhill was on the spot to thwart Cesc Fabregas a minute later after he weaved his way through the home side's defence
But Saido Berahino unleashed an unstoppable curling right-footer from just outside the Chelsea penalty area. It flashed past Courtois to put Albion ahead on nine minutes.
A speculative long-range effort from Nemanja Matic inched wide of Myhill's goal as the Blues went in search of an equaliser.
It should have come on 25 minutes when a byline cut across by Diego Costa was clipped on by Eden Hazard but Jolean Lescott deflected the ball,over the crossbar.
All hell broke loose on 28 minutes when Costa and and McAuley faced up to each other in and off-ball situation. Mike Jones brandished a yellow card to Costa and when Fabregas, 20-yards away and having seemingly asked for the ball from Hazard kicked the ball back into the mere of players and ref. It hit Chris Brunt In the head. Jones decided that was sufficient for a red card to the former Arsenal midfielder. Darren Fletcher then got a yellow card for facing up to Fabregas.
Jonas Olsson then got a yellow for upending Costa on the edge of his penalty area.
A blistering Filipe Luis strike from the resultant free-kick produced a fine save from Myhill with six minutes to the break.
Brunt got away from Cahill and let fly with a left footer, but Courtois kicked the effort away.
Then it was Chelsea's turn and Loic Remy saw an on-target shot defected away by Olsson after excellent set-up play by Hazard.
Neither manager made a change at half-time.
But it made no difference as within a minute of the restart Berahinho eased his way though the Chelsea rearguard and was tripped by Terry for a penalty. He picked himself up and just about got the ball past Courtois to double their lead.
Remy let fly with a fierce left footer from the edge of the WBA penalty area on 56 minutes, but his effort bounced off Myhill's right post to safety with the goalkeeper well beaten.
James Morrisonj then forced Courtois into tipping the ball over his crossbar. From the corner the ball went to Brumt who bulleted home a powerful drive to make it 3-0.
Jean Cuadrado replaced Costa on 63 minutes.
Quite how Matic failed to score on 74 minutes just summed up the night for Chelsea as Myhill somehow scrambled the effort off the line.
Nathan Ake replaced Loftus-Cheek just seconds before.
Izzy Brown replaced Remy to make his Chelsea debut with 11 minutes to go.
Next up for the Blues is the final league game of the season at home to Sunderland.
Teams: Chelsea: Courtois; Ivanovic, Cahill, Terry (c), Filipe Luis; Loftus-Cheek, Matic; Remy, Fabregas, Hazard; Diego Costa.
Subs, Blackman, Ake, Brown, Azpilicueta, Christensen, Cuadrado, Mikel
WBA: Myhill, Dawson, McAuley, Olsson, Lescott, Brunt, Fletcher, Yacob, Morrison, McManaman, Berahino.
Subs: Rose, Wisdom, Baird, Mulumbu, Gardner, Anichebe, Ideye.
Referee