The first ever European tie between bitter rivals Liverpool and Manchester United will so far be remembered for a defensive error from Memphis Depay.
The Dutch attacker, who's had a difficult first season at Old Trafford, conceded a penalty when he pulled down Nathaniel Clyne before Daniel Sturridge tucked home the resulting spot kick.
Initially it looked like the challenge had occurred just outside of the penalty area, but replays later showed that contact continued inside the box.
United fans were unsurprisingly not happy with the challenge that saw their team trailing at half time, and took to Twitter to air their frustrations.
https://twitter.com/BarFFFer/status/708027142710415360
https://twitter.com/FussballKevin/status/708027127669592065
https://twitter.com/CameronKirk_/status/708027069209452545
https://twitter.com/Douglas517Rob/status/708026958442045441
https://twitter.com/WR10Dev7/status/708026920017874944
https://twitter.com/_sxnk/status/708026723544109056
https://twitter.com/MyNameIsWozman/status/708026719022751744
