Jose Mourinho must be developing an intense hatred for visits to Villa Park after Martin O'Neill condemned Chelsea to yet another dose of Midlands misery.
Debutant Zat Knight and Gabriel Agbonlahor both scored in the second half to leave Mourinho still waiting for his first Premier League victory at this particular corner of the West Midlands.
It was Chelsea's first defeat of the season but it was a performance that will do little to suggest that Mourinho can deliver his third title.
Villa fully deserved their victory with an effervescent performance and are surely certain to make a marked improvement on their first season under Martin O'Neill.
Knight, who was brought up a stone's throw away from Villa Park, secured the first goal with a towering header, helping the giant defender to erase the memory of his performance only last week at Villa, for his former club Fulham, that culminated in him scoring in his own net.
And Agbonlahor pounced a minute from time to leave Chelsea frustrated for another year after another fruitless visit.