It's fair to say A-League champions Adelaide are having a shocker of a season, but this own-goal from Iacopo La Rocca could be their lowest moment.
Adelaide can't slip any lower on the ladder - they're last - but they plunged to fresh, dark depths in a ramshackle display against Perth Glory on Friday night.
After kickoff was delayed one hour because of extreme heat, La Rocca neatly scored the first goal - for Perth.
The Reds' defender inexplicably headed a Josh Risdon cross into the net from close range in the 15th minute - the goal would have been perfectly executed, had it been at the other end.
The own-goal sapped Adelaide's spirit and Perth capitalised in ruthless fashion to bank their seventh win of the season.
The loss was Adelaide's biggest on home soil, eclipsing their 0-4 result just seven weeks ago against Sydney FC.