The Cookie Monster has been a Sesame Street fan favourite ever since he first came onto our screens back in 1969, but some fans are only just discovering his real name.
The furry blue puppet took to Twitter to reveal his true identity, with some fans demanding "proof".
He wrote: "Did you know me name is Sid? But me still like to be called Cookie Monster."
The shocking post has had more than 38,000 likes and has been re-shared almost 5,000 times. Fans flooded the comments section to share their surprise at the revelation.
"I've known you for 45 years and am just learning this today. This is amazing," one person wrote.
Another added: "NO WAY!! I wanna see proof, show us your birth certificate."
A third fan commented: "I had no idea your name is Sid. Apologies for most of us not trying to know you better past your cookie eating hobby," while another said: "I did not know this! Sid is a cool name!"
"You name is WHAT," questioned a fifth person.
While some fans were surprised by the news, others pointed out that it isn't the first time the Cookie Monster has shared his real name.
In 2010, the Sesame Street official Twitter account wrote: "Cookie Monster: Me wasn’t born with name “Cookie Monster”. It just nickname dat stuck.
"Me don’t remember me real name… maybe it was Sidney?"
The character also mentioned his real name in a song back in 2004 and used it again in a 2017 interview.
Sesame Street was first aired in 1969 and is a long-time favourite of both children and adults. Created by Joan Ganz Cooney and Lloyd Morrisett, it has become one of the longest running TV shows around the world.
The show has a long tradition of dealing with difficult topics in a way that children can understand.
Just last year, two black characters were added to the cast to educate children about racism.
In 2019, Karli was brought in, whose mother battled addiction issues, while four years prior, the first autistic Muppet debuted.
In 2002, the South African version Takalani Sesame, introduced a five-year-old HIV-positive Muppet, who was also an orphan.
When Will Lee, the actor who played Mr Hooper, died in 1982, the writers chose to centre an episode on the concepts of death and grief.
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