A second-half brace from Ismaila Sarr put the Hornets in control before the Senegal attacker set up Troy Deeney 18 minutes from time to provide the cherry on top of a fine performance from Nigel Pearson’s side.
It ended the Reds unbeaten run of 44 league games, meaning they fall short of matching Arsenal’s Invincibles from the 2003/04 campaign, who had gone the season and overall 49 matches without defeat.
The first Premier League loss for Liverpool in over a year does little to their hopes of winning the title, but ensured they missed out on including equalling Man City’s run of 19 straight top-flight wins.
“I am not surprised by the performance because that would mean I never saw something like that before. I saw it a lot of times,” Klopp said.
“What I can say and I think is 3-0 is a bit harsh, but we had a big hand in that so we don’t have to think about that.
After losing at Atletico Madrid on February 18, Liverpool have now suffered two defeats in three games in all competitions.
When quizzed on missing out on becoming an invincible like Arsenal, Klopp again reiterated he was not focused on that achievement.
“I don’t think you can break records because you want to break records, you break records because you are 100 percent focused on each step you have to do,” he added.
“Tonight we were not good enough and it is not a plus for me that in history they will look back in 500 years and say Liverpool nearly did it.
“Nearly did it is not my main concern. We cannot change that and any time we will lose a game, we will lose a game.
“We didn’t wait for it, but it was clear it would happen so we didn’t think about it. We still knew it would happen and tonight it happened.
“I see it rather positive because the closer we get to these records, I am not bothered, but I am not sure how other people think about that so from now on we can play free football and don’t have to defend or try to get the record.
“We just try to win football games again and that is what we will do.”
After creating the better chances in the first half, the Hornets made their dominance count when Sarr opened the scoring in the 54th minute from Abdoulaye Doucoure’s cross.
Trent Alexander-Arnold’s poor back pass allowed Sarr to get in again with 72 on the clock and he laid back for Deeney to curl home and send Vicarage Road into pandemonium.
The 3-0 win took Watford out of the relegation zone on goal difference, but Pearson insisted now was not the time to get carried away.
“I wish I could enjoy the good times a bit more,” the 56-year-old admitted. “I am already looking at the next game in my own mind.
“It is very satisfying and it is good to get reward for everybody’s work. My job is to steer the ship and try to keep some perspective in terms of where we are.
“It is a very satisfying and fantastic win, but with 10 games left we have got an awful lot of work to do.
“Our season so far has been I suppose littered with disappointment so we have a lot of catching up to do.”