Two weeks ago, Palace ended a seven game losing and goalless streak by beating champions Chelsea with a performance full of energy and fight. Since then they've lost two on the trot, including a "capitulation" at Bristol City (Roy Hodgson's word).
West Ham were abject at home against Brighton last Friday and also in the first half against Tottenham on Wednesday. Then, suddenly, they turn it on and win 3-2 at Wembley.
They've shown they can both do it. Now they just need to do it on a regular basis.