In the photo (which you can view below), Zuckerberg can be seen walking through an audience of people hooked up to virtual reality headsets at the Mobile World Congress, a tech conference, in Spain. Zuckerberg made a surprise appearance to talk about Samsung’s Gear VR and hinted at Facebook working more closely with Samsung in the future.

Zuckerberg is slated to give his own keynote address on Monday, which you can read more about on Fortune.

The photo, which was posted on Sunday, has since garnered over 55,000 likes and over 15,000 shares.

https://twitter.com/ow/status/701528914691227648?ref_src=twsrc%5Etfw

“Damn, It’s kind of creepy,” wrote the top Facebook comment on the photo. “Mark—doesn’t it feel strange to be the only one walking with your real eyes, while everyone else are zombies in the matrix?” wrote another.

Here’s some of the commotion it’s caused on Twitter:

https://twitter.com/ow/status/701528914691227648?ref_src=twsrc%5Etfw

https://twitter.com/kgasso/status/701536811416363008?ref_src=twsrc%5Etfw

https://twitter.com/ndebock/status/701505382506749953/photo/1?ref_src=twsrc%5Etfw

The photo comes as Facebook recently announced that it’s teaming up with Nokia, Intel, and other companies on an open-source hardware and software platform, as Fortune reported.