League One leaders Nottingham Forest produced a shocking performance at home as they were hammered by Scunthorpe.
Scunthorpe outplayed Forest from the start and went ahead when Cleveland Taylor fired in after poor defending.
Andy Keogh doubled it with a precise shot after Forest failed to clear and the hosts' defence again went missing for Ian Morris to coolly shoot home.
Top scorer Billy Sharp got a goal his display deserved at the end, running though and lashing past Paul Smith.