Few would have made the Reds the favourites before they kicked off against the La Liga champions, with most only predicting that Luis Suarez would be the star of the show against his old club.
Sadio Mane put Jurgen Klopp's men in front, but while Barca responded well, the game was all but over thanks to 76 crazy seconds at the start of the second half.
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Jordan Henderson made an impact just moments after coming off the bench, somehow getting past two defenders in the box to force former Liverpool man Javier Mascherano to put the ball into his own net after some decent work down the wing.
Brilliance from Liverpool
And a little over a minute later, it was 3-0, this time Divock Origi showing why he's a more than capable replacement for the perpetually injured Daniel Sturridge.
Henderson has had his own injury concerns in recent months, so he will be pleased to have played a part in the goal. Take a look at Mascherano's unhappy reunion with his old side here:
Origi's finish was far more composed, particularly for a player who is still only 21 years old.
Of course, while the show they put on at Wembley won't earn them any points, Liverpool fans will no doubt still be delighted with the performance which has to be a good omen going into the new Premier League season.
Where will Liverpool finish this season? Have your say in the comments.