An iPhone X ad predicted Apple employees walking into the glass walls at its new $5 billion headquarters

Apple employees have called 911 three times this year because people have walked into glass walls at the company's new $5 billion headquarters in Cupertino, California, Apple Park.

The details were reported by San Francisco Chronicle's Wendy Lee and the story was broken by Bloomberg's Mark Bergen; you can read the 911 transcripts here.

But someone in Apple's marketing department may have been trying to subtly get the word out sooner - in a big, splashy ad for Apple's iPhone X that millions of people have seen. 

Check out this ad that first aired back in September. Someone walks into Apple's "most durable glass ever" about 13 seconds in: