Derby County beat Manchester United 8-7 in a dramatic penalty shootout at Old Trafford to reach the Carabao Cup fourth round.
After 15 successful penalties, Derby goalkeeper Scott Carson saved Phil Jones' effort low to his left to secure victory for Frank Lampard's side.
In an incident-packed tie, United took the lead through Juan Mata's first goal in nine months.
Harry Wilson - on loan from Liverpool - equalised with a brilliant dipping free-kick from 30 yards.
United keeper Romero, making his first appearance of the season, was sent off for handball before Jack Marriott's header put Derby 2-1 ahead.
The hosts needed a 95th-minute header from substitute Marouane Fellaini to send the tie to penalties.
Lampard, who played under United boss Jose Mourinho at Chelsea, celebrated with his players on the pitch in front of 3,000 travelling fans after knocking the five-time winners out.