Barely hours after Manchester United's shock 1-6 loss at home to Tottenham Hotspur, Premier League champions Liverpool came thudding down to earth with a heavy 2-7 defeat against Aston Villa.On a high-scoring day of Premier League action that produced 25 goals, Liverpool and Manchester United found themselves on the receiving end of inspired opposition, as two of the most successful teams in English top-flight history conceded a scarcely believable 13 goals between them.While Manchester United's lopsided defeat could be construed as a continuation of their indifferent start to the season and the fact that they were severely inhibited after the sending off of Anthony Martial, Liverpool simply did not have any such excuses.The reigning champions, with three wins from as many games, seemed to have started the new season from where they left off in the last campaign, but they were woefully unprepared for what awaited them at Villa Park.It was the home side who impressed in the early proceedings as they raced to a two-goal lead midway through the first half. After Villa missed a gilt-edged chance to triple their advantage. Mohamed Salah struck back for Liverpool as the champions sought a way back into the game.However, that was not to be. Ollie Watkins completed his first Premier League hat-trick before the interval as Liverpool fell 1-4 behind at the break. To their credit, the hosts did not opt to sit back in the second half and set up spectacularly smashing Liverpool's aura of invincibility, as their 7-2 win marked one of the most stunning upsets in Premier League history.Defeat at Villa Park. #LFC | #AVLLIV— Liverpool FC (@LFC) October 4, 2020On that note, let us have a look at ten amazing facts about Liverpool's chastening defeat at Villa Park.Liverpool's lopsided defeat at Villa Park marked the first time in English top-flight history since 1953 that a reigning champion conceded seven goals in a game. The Anfield club's defensive frailties were exposed by newly-promoted Leeds United in the first game of the season, as Marcelo Bielsa's side fought back from a goal down on three occasions only to come up second best in a seven-goal thriller.However, Liverpool failed to heed the warning and came crashing down at Villa Park, as they suffered the ignominy of being the first Premier League winners to ship more than six goals in a game.7 - Liverpool are the first reigning English top-flight champions to ship seven goals in a league match since Arsenal against Sunderland in September 1953. Embarrassed. #AVLLIV pic.twitter.com/CAnLAPG7b5— OptaJoe (@OptaJoe) October 4, 2020It marked the first time Liverpool conceded seven goals in a game in any competition since losing 2-7 to Tottenham in a league game in 1963.7 - Liverpool have conceded seven goals in a game for the first time since April 1963, in a 7-2 defeat to Tottenham Hotspur. Crushing. #AVLLIV pic.twitter.com/CrvMuNFuYk— OptaJoe (@OptaJoe) October 4, 2020In the process, Jurgen Klopp suffered the most lopsided defeat of his illustrious managerial career in terms of goals conceded. The German tactician had earlier been on the receiving end of a 1-6 humbling at home against Werder Bremen in the 2006-07 Bundesliga.Jurgen Klopp has suffered the heaviest defeat in his managerial career 😳https://t.co/ufIAUyCXRT— talkSPORT (@talkSPORT) October 4, 2020Quite bizarrely, the reigning champions have now conceded as many as 11 goals in just four Premier League games this season, with only 17th-placed West Bromwich Albion (13 goals) conceding more goals as things stand.Only West Brom have let in more goals than Liverpool in the PL this season.— Duncan Alexander (@oilysailor) October 4, 2020It also marked the first time the two most decorated teams in English top-flight history - Manchester United and Liverpool - conceded six or more goals on the same day.6 - For the first time in the two clubs' history, both Liverpool and Manchester United have conceded six goals in a match on the same day. Unbelievable. pic.twitter.com/42vsBHULeH— OptaJoe (@OptaJoe) October 4, 2020Since losing 1-6 at Stoke City in Steven Gerrard's last game for the club in 2015, Liverpool ended up conceding six or more goals in a Premier League game for the first time.6 - Liverpool have conceded six goals in a Premier League game for only the second time, also shipping six in a 6-1 defeat to Stoke in May 2015. Bonkers. #AVLLIV pic.twitter.com/k2jRyGFEzj— OptaJoe (@OptaJoe) October 4, 2020For Villa's hat-trick hero Ollie Watkins, the player marked his first goals in the Premier League with a hat-trick, as the hosts scored seven goals in a Premier League game for only the second time in their history.It also marked the first time Liverpool conceded a hat-trick in the English top-flight since Dimitar Berbatov did so for Manchester United in 2010.10 - Ollie Watkins is the 10th player to score a @premierleague hat-trick against Liverpool, and the first since Dimitar Berbatov in September 2010. Hero. #AVLLIV pic.twitter.com/5u1e3c8lve— OptaJoe (@OptaJoe) October 4, 20207⃣ @AVFCOfficial score 7 goals in a PL game for only the 2nd time (won 7-1 v Wimbledon in 1995 under Brian Little) Also first time Liverpool have conceded 7 since a 7-2 league defeat at Tottenham in April 1963 pic.twitter.com/dZHZawXYJx— Sky Sports Statto (@SkySportsStatto) October 4, 2020Interestingly, Jose Mourinho's Chelsea had conceded all of 15 goals during a victorious 2004-05 Premier League campaign. A decade and a half later, Liverpool and Manchester United combined to concede almost as many on a single day.In 2004-05, José Mourinho's Chelsea team conceded 15 goals across an entire 38-game Premier League season.Liverpool and Man Utd have conceded 13 combined... today. pic.twitter.com/kV9lwuVzzB— Squawka Football (@Squawka) October 4, 2020While there were many Liverpool players who flopped big time against Villa, goalkeeper Adrian may arguably be the worst of the lot. In the absence of Alisson Becker, the Liverpool custodian endured a torrid outing and made a major error leading to a goal yet again.5 - Adrián has made five errors directly leading to opposition goals in his 21 appearances for Liverpool in all competitions; as many as counterpart Alisson has in 92 such matches. Comparison. #AVLLIV pic.twitter.com/x5dGrzyYLd— OptaJoe (@OptaJoe) October 4, 2020