Neal Maupay opened the scoring in Brentford's 3-1 defeat by Man City in bizarre fashion after Ivan Toney took advantage of lesser-known rule.
A stunning Phil Foden hat-trick ultimately condemned the Bees to a loss, but for 24 minutes in the match they were ahead after Maupay's 21st minute goal.
As Brentford keeper Mark Flekken launched a goal kick towards the halfway line, Toney came back from an offside position.
The striker held off Nathan Ake but didn't touch the ball, and it ran beyond the Dutchman.
Maupay - who was the furthest man forward - picked up the loose ball and finished coolly past Ederson in the City net as Pep Guardiola's side protested to the officials that both he and Toney were offside.