If ever we could compare a human being to marmite, Diego Costa provides us with that opportunity, because you either love him, or you hate him.
The Spaniard sparked mass controversy during Chelsea's 2-1 victory over West Ham United at Stamford Bridge when the 27-year-old fouled Hammers' goalkeeper Adrian aggressively.
It was argued at the time that Costa should have been shown a red card, which Mike Dean could quite easily have been done as he was already on a yellow card at the time.
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When Adrian dawdled on the ball for too long, like a lion, the Blues striker pounced in, and whilst attempting to dispossess the goalkeeper, he seemed to stamp on his lower leg.
That alone is a red card offence, so you can see why basically everybody who doesn't support Chelsea was so annoyed to see that he wasn't shown a second yellow card.
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People became even more irritated when he struck the winning goal in the 89th minute to edge a 2-1 win.
Let's take a look at some more of Costa's devilish acts.
One of Diego Costa's most memorable clashes came in Chelsea's 2-0 victory over Arsenal at Stamford Bridge last season.
First, the forward was seen to be having a wrestling match with centre-back Laurent Koscielny, but replays showed that Costa was swinging his arms around viciously as the cameras captured him whacking the Frenchman in the face once or twice.
But, if Koscielny thought he was going to get away with it that lightly, he'd have to think again. Shortly afterwards, Costa appeared to have dramatically thrown himself to the ground in order to win a penalty, but Mike Dean was having none of it.
Like a bull, Costa saw the red shirt of Koscielny's and went into attack mode, pushing him to the ground. When Gabriel Paulista came to intervene, the situation heated up as Costa slashed the Brazilian's neck.
The drama was only just beginning, despite it seeming that Dean had everything under control. Costa patted Gabriel on the back apologetically, but the defender didn't approve and hit the chest of Costa. The forward then reacted with a harder hit, which resembled more of a smack.
The pair exchanged words whilst walking away after both being booked, but when play was about to resume, Costa appeared to force himself on Gabriel once again in an attempt to purposely get stamped on.
The forward was successful in his efforts as Gabriel was sent off controversially.
That wasn't the first time Costa had been in the bad books, and certainly wouldn't be the last.
Back in his La Liga days at Atletico Madrid, he had a fierce rivalry with Pepe - with the two enduing many confrontations.
In the Premier League, Costa has a reputation for stamping on people. Adrian was his latest victim on Monday night, whose name was added to an ever growing list of names.
However, the 27-year-old, astonishingly, hasn't seen red in his Chelsea days. Why is this? Maybe referees fear how he will react. Perhaps someone needs to bite the bullet and put the striker back in his place.
Costa endured a frustrating season last year in comparison to his debut campaign at Stamford Bridge.
His first year saw him score 20 goals in 26 games, whilst he only scored 12 in 28 last season. This downgrade in form could be put down to the managerial switch around in west London, so now there is a secure manager at the Bridge, maybe the former Atletico man can provide goals aplenty this season.
He certainly got off to a positive start on Monday night.
However, there is talk that a return to the Vincente Calderon Stadium is on the cards for Costa.
These rumours have simmered down over the past week, however, and he seemed pretty delighted to have won Chelsea's opening game, maybe hinting that he's happy at Stamford Bridge after all.
After getting off to a good start last night, with regards to goal scoring that is, Costa can really thrive this season and can help boost Chelsea's hopes of returning to European football by scoring in advance of 15 goals.
Is He Really That Good?
Away from his fury and acting like an absolute idiot, Costa can be a pretty decent player. He's confident with running forward with the ball and he's a clinical finisher, which could prove crucial towards the Blues' title bid under Antonio Conte, considering he is their go-to forward.
Also, the 27-year-old can use his bullish strength to his advantage, rather than trying to have a boxing match with everyone he comes face-to-face with. This can be essential when trying to retain possession, something which Conte is extremely fussy about.
Twitter vs Diego Costa
Diego Costa has come across many tough nuts in his career. David Luiz, Pepe, Martin Skrtel - the list goes on - but one opponent Costa can't punch in the face or stamp on is Twitter.
Here's what some of his haters had to say:
But, would Costa really be fazed by any of his haters?
What do YOU think about Diego Costa? Let us know YOUR thoughts in the comments section below!