While exploring the Warped Forest, I decided to look at an Enderman. To my (creative) surprise, the enderman reacted with his noise. Although, it was starting once every twentieth of a second.

Below, I have included a video demonstrating this.

**Nevermind. I am unable to upload the .mp4 video file or any image files**

 
Of course, this is rather unusual. Being in Creative Mode, and playing the Betas, this was an obvious Beta bug.
 

Snapshot Bugs, I tell 'ya!