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You may remember Carrey rocking the wispy eyebrows and trademark green fur when he became The Grinch for Ron Howard's 2000 Christmas flick, How the Grinch Stole Christmas, which was based on Dr Seuss's 1957 book of the same name.
Well, it seems Carrey still has a bit of a soft spot for the iconic anti-hero, having stepped back into character while doing press for the new Sonic film - seemingly with complete ease.
Carrey was speaking to Rotten Tomatoes about his turn as Dr Robotnik, and his return to comedy.
He said: "I've been doing some serious stuff and then something like this comes along and it's just an opportunity presented to me by the universe.
"It's really kind of fun, it's really kind of great. It's a part of me that never leaves - you know, people don't have to worry that I'm never going to have that part of my brain, that just wants to have some silly fun."
Asked about how he feels when he sees his characters brought to life by others at Halloween, he continued: "It's really fun when you see a little kid dressed up as The Grinch, or something like that - or they come up to me in the streets and their parent says, 'You know who that is? That's The Grinch'."
Contorting his face, Carrey said: "And I go, 'I must find a way to stop Christmas from coming'."
"And their parents go, 'Oh, I thought it was makeup'."
The clip was shared on Twitter, where it soon went viral - and where many fans had the exact same epiphany.
One commented: "This whole time I thought it was makeup helping him do that face."
Jim has to be made of living clay!! It's the ONLY explenation!! :joy::joy: It's so freaking creepy and cool how he can just mold his face like that and back to normal so smoothly!! pic.twitter.com/cMmRkgatKJ
- Jake Is Hyped For The Sonic Movie (@Venturian628) February 10, 2020
Another said: "Jim Carrey has always been made out of rubber."
A third added: "Jim Carrey has extra muscles in his face. It's the only explanation."
Sonic The Hedgehog is out in cinemas on 14 February.
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