Barcelona's unbeaten start to the La Liga season was brought to an end on Wednesday night.
After an uninspiring draw against Girona on Sunday, the Blaugrana struggled away at Leganes, losing 2-1 to a team who were previously without a win.
Philippe Coutinho had given Barca the lead with a stunning volley in the first-half, but it all went wrong in the space of 69 second-half seconds.
Goals from Nabil El Zhar and Oscar Rodriguez sealed the most unlikely of victories, leaving many fans questioning Ernesto Valverde's rotation.
Thomas Vermaelen was given a surprise start at left-back, while Munir was given the nod in attack - both were well below-par.
The only solace for the manager and fans was the 3-0 loss inflicted on Real Madrid by Sevilla shortly after, meaning Barca are still top of La Liga.
However, there is so much frustration coming from the squad of late and Leganes goalkeeper Ivan Cuellar blasted the Barca squad for their 'ugly gesture' after the final whistle.
“We are an unassuming side but we would have preferred a different reaction from Barcelona,” Cuellar told Cadena Ser.
“If you are a team who are used to winning and you do not, you should congratulate the other team but Barcelona did not do that to us.
“None of their players came over after the game, that it not the right way of doing things, it is ugly and should not happen.
“I was very pleased with my performance and the saves I made, but the important thing is always the team and I am just glad I could play my part.
“We did not start well and I was disappointed for my own par in their goal but we did well to take advantage of them switching off.
“When we entered the closing stages of the game, we had faith and belief in ourselves even though they are one of the best teams in the world.”
Frustration has definitely taken its toll and their match against Athletic Bilbao on Sunday is now of critical importance.