A calamitous 12 second-half minutes saw Liverpool concede a three-goal lead at Crystal Palace on Monday, after two Dwight Gayle goals completed an impressive Premier League comeback from Tony Pulis' men.
It started so well for the Reds, who stormed into a commanding lead courtesy of Joe Allen, Daniel Sturridge and Luis Suarez. Their basic requirement, to get the three points needed to keep the pressure on Manchester City, turned into a call for more goals in an attempt to reduce the goal-difference deficit.
But as they piled their numbers forward, suddenly their defence started to look shaky, and all it took was a deflected Damien Delaney strike on 79 minutes to kick-start a remarkable comeback for Palace.
As it stands, Liverpool have returned to the summit of the Premier League with 81 points, a point ahead of City, whose game in hand will be played at home against Aston Villa on Wednesday.
Here are six things we learned from Liverpool's capitulation on Monday.