Reiss Nelson netted a stunning 97th-minute winner as Premier League leaders Arsenal came from two goals down to beat Bournemouth.
Bournemouth had taken the lead after just 9.11 seconds through Philip Billing, and went 2-0 up via a Marco Senesi header.
However Arsenal pulled level with goals by Thomas Partey and Ben White, before Nelson struck.
The winger, making his first appearance since 12 November, slammed in from 25 yards in the seventh minute of stoppage time.
Arsenal’s Premier League lead is restored to five points, after they had seemed certain to cede ground to Manchester City, winners over Newcastle in the early kick-off.
Bournemouth, meanwhile, remain in the relegation zone after threatening a major upset – and beginning at top speed.
