Netflix viewers only just realising where they recognise 'tudum' sound from and they can't get over it

You open up the Netflix app, and what do you hear before the listings appear? Tudum!

Such has been the way since 2015, when the sound was first added to the beginning of every movie and television series on the streaming service's roster.

But have you ever wondered why Netflix bosses went for that particularly iconic noise when planning their format?

And why it was only 10 years ago, when the app was founded in 2007?

Well, it turns out that there's one theory posed recently that claims to answer to both of these vital questions.

And let's just say, they've seemingly left a handful of subscribers utterly mind-blown.

Before getting into the theory, we have to go back to 2013 - the year that House of Cards became the first TV series produced by Netflix.

Starring controversial Hollywood veteran Kevin Spacey as dubious politician Frank Underwood, the thriller sees him and his team do anything and everything they need to secure further power.

Despite the disgrace that would later fall upon Spacey, in its prime, the show was deemed a critical success, bagging a staggering 33 Emmys and eight Golden Globes.

And apparently, one episode played during the show's hey day inspired the 'tudum' sound - according to a batch of online conspiracy theorists.

In the 2014 season finale, Frank could be seen angrily banging on his wooden desk twice, using his fists.

The sound made is also identical to the 'tudum' we still hear when we open the app.

The show was axed in 2017 (Netflix)

In 2017, however, after being accused of sexual misconduct, the lead actor was let go from the production.

House of Cards ran for one series more before receiving the ultimate chop.

As we say, some viewers have been left baffled by the notion that this could have inspired the sound - even though the streaming service bosses have never confirmed such a theory.

One Netflix viewer posted the following on Twitter recently: "It’s so funny that Netflix now claims a different, brand safe origin for their 'tudum' sound to distance themselves from Kevin Spacey/House of Cards despite it clearly being a slightly modified version of how Season 2 end."

Another penned: "Holy sh*t, never knew this".

"Yeah, it’s hilarious how they’re rewriting history when the connection is so obvious. The House of Cards ending 'knock' is literally the blueprint for tudum!" a third added.

Netflix bosses previously claimed the sound was created another way (bymuratdeniz/Getty)

Despite the theory, Netflix previously claimed the sound had no association with the series.

The company's VP of product Todd Yellin previously told Audiospheric they'd teamed up with Oscar-winning sound editor Lon Bender to come up with a distinct sound that'd be used to introduce Netflix series.