The shouts of frustration at the Emirates had a ring of familiarity about them.
I hadn't heard them for a while but when Martin Odegaard looked as if he was going to score in the midst of a first-half glut of missed chances but slammed his shot on to the crossbar instead, some angry yells poured down from the stands and from the seats abutting the press box.
That is not a criticism of Arsenal fans, by the way. Their team's wastefulness in front of goal against Liverpool on Sunday evening would have tried the patience of a saint.