What do you hear in this clip? iPhone, 4-9 or Fortnite?

This has our heads rattled!

A new audio illusion is going viral.

This one sounds like it could be one of nine different words and has left a lot of people scratching their heads.

The words people hear include:

1. iPhone
2. Fortnite
3. 4-9
4. 9-4
5. nightfall
6. nice one
7. ninth floor
8. throw a knife
9. an eye for an eye

Twitter user, Matt Deegan shared the clip in the past few days. What word do you hear?

So, which one do you hear?
? iPhone
? 4-9
? 9-4
? Fortnite
? 9th Floor
? Nice One
? Nightfall
? Throw A Knife
? Eye for an Eye pic.twitter.com/Ux6z8mcuZf

— Matt Deegan (@matt) February 26, 2021

The online debate is similar to the 'Yanny or Laurel' clip which surfaced back in May 2018.