A last-gasp strike from Dani Ceballos capped a dramatic finale at Bramall Lane and propelled us into the semi-finals of the Emirates FA Cup.
The Spanish midfielder collected a loose ball inside the box and beat Dean Henderson from a narrow angle - just when it seemed the home side had forced extra-time.
David McGoldrick had equalised just moments before when we failed to deal with a long throw-in and Sead Kolasinac's attempted clearance hit Shkodran Mustafi.
Nicolas Pepe's penalty had given us a first-half lead after Alex Lacazette was clattered just inside the area as he controlled a pass from Kieran Tierney.