Nottingham Forest produced a superb performance to shock Liverpool and climb off the bottom of the Premier League at a boisterous City Ground.
Taiwo Awoniyi, who left Liverpool in 2021 without making a competitive appearance, hit the winner from close range after his initial attempt came back off a post.
Liverpool were a long way from their best - Virgil van Dijk wasted their best chance - and remain without an away league win this season.
Forest could have won by a more handsome margin, with Morgan Gibbs-White's effort deflected over before substitute Brennan Johnson was denied by Liverpool keeper Alisson.