Encouraged no doubt by the Mayor of London's decision to approve plans for a stylish new stadium at Stamford Bridge, the Chelsea supporters attacked their rivals where it hurt.
No fighting this time. Just one cutting taunt. 'You're not West Ham anymore,' they sang from the comfort of a 1-0 lead.
Chelsea are proud to be staying at home. In Fulham. Where they've always been. When does logic come into it?
West Ham have moved the short distance from Upton Park to Stratford and it is not perfect by any means but they are still West Ham, prone to the usual fallibilities as the fingernails of Slaven Bilic will testify.