The Megalodon Easter egg in Battlefield 4 was very well known in the community once it was discovered. But now, the giant mega shark reemerges in Battlefield 1.
YouTube user DANNYonPC posted a video showing the shark in action, complete with directions on how to summon him. The Megalodon was added with the "They Shall Not Pass" DLC and is summoned with a complex order of commands seen in the video.
There have been other Easter eggs in Battlefield 1, but this one was a callback to an equally ridiculous one. "They Shall Not Pass" is available now on every system with Battlefield 1.