Welcome to the Premier League, Christian Pulisic.
We don't think the American was under any illusion that English football would be easy, but he couldn't have foreseen a 4-0 thrashing in the opening game in his most pessimistic of thoughts.
At that point, a Marcus Rashford penalty separated the two sides, while the Blues had been unlucky not to find an equaliser with both Tammy Abraham and Emerson Palmieri hitting the woodwork.
However, the floodgates opened after 60 minutes with Anthony Martial scoring from close range, Rashford helping himself to another and debutant Daniel James finishing off the rout.
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Man Utd 4-0 Chelsea
Pulisic was introduced to the game after 58 minutes, while the game was still competitive, and admittedly added a new impetus into the Chelsea midfield.
He used his pace and trickery to dodge Aaron Wan-Bissaka just seconds after coming on, but failed to make an impact for Frank Lampard's men as the game slipped away from them,
There was very little that Pulisic could have done about the situation, yet it was still a rude awakening for the penultimate signing of Chelsea's pre-transfer ban era.
Pulisic's old tweet spammed
As a result, there were plenty of fans poking fun at the 20-year-old on Twitter and that was especially the case when one of Pulisic's posts from 2014 came to people's attention.
For whatever reason, the Chelsea winger decided to write: 'When you know you made a mistake..' in February 2014 and it's now getting more attention than ever five years later.
It will come as little surprise that United fans have flocked to the post in their masses, replying with the likes of 'Still time to leave,' 'Should've stayed at BVB' and 'Not too late to get to Heathrow.'
Check out the original tweet down below:
Is the regret setting in, Christian?
What makes the situation all the more cringe-worthy is that images of a young Pulisic posing in United jerseys and at Old Trafford have started to do the rounds.
While Pulisic has never been linked to the Red Devils with any great credence, he might well have wished he held out for his childhood team after the result on Sunday.
However, the American can at least seek solace in the fact his teammates Mason Mount and Tammy Abraham were also given a baptism of fire on their big chances to impress.
The whole situation gives Lampard a real headache going into games with Liverpool and Leicester City and begs the question: will he stick or twist?
If Lampard opts for the latter, then it could give Pulisic the opportunity to shine at Stamford Bridge and potentially rebuttal an old tweet that has already come back to haunt him.
Do you think Pulisic will be a success at Chelsea? Have your say in the comments section below.News Now - Sport News