Sunderland scored four first-half goals to thrash Crystal Palace at Selhurst Park as the Black Cats moved level on points with their Premier League relegation rivals.
Lamine Kone reacted quickest to Wayne Hennessey's spill to steer in Sunderland's opener after 10 minutes.
The visitors then scored three goals in six minutes in a stunning end to the first half as Didier Ndong struck a superb effort from 25 yards before Jermain Defoe punished lax Palace defending with two excellent finishes.
A fan got onto the pitch to confront Damien Delaney as the Palace players were booed off at half-time on a miserable afternoon for Sam Allardyce against his former club.