The most mind-bending example of the magic eye effect I've found is people using it in videos.

Of course, the internet being what it is, someone made a version of Bad Apple with it: https://www.youtube.com/watch?v=RLuGJGyCS90

Pandas CI broke today because of the leap day and testing for datetimes. Pretty similar story to the other Python examples.

edX videos/lectures have this feature exactly, with a transcript of links next to the video.