The FA Cup is no stranger to shock results and this weekend's fifth round ties see a host of potential banana skins among the Premier League's elite.
Manchester United, Manchester City, Tottenham Hotspur and Chelsea all have reasons to be fearful even though the quartet will start as strong favourites to reach the quarter-finals.
But where are upsets most likely to happen? Sportsmail looks at each of the eight fixtures and assesses their shock value...
Leicester City vs Sheffield United
These sides have already played each other this season with Leicester City running out easy 4-1 winners in a second round Carabao Cup match at Bramall Lane in August.