An unexpected problem has cropped up at Apple's fancy $5 billion campus in Cupertino, Marketwatch has reported: People are apparently wounding themselves by walking into the building's many glass walls and doors.

Yes, like a real life Windex commercial with well-heeled tech employees instead of birds, multiple people have allegedly been injured upon impact with the glass surfaces.

In at least two cases in the first weeks of the spaceship campus's opening, one of them involving an Apple employee, those injuries were serious enough that emergency services were called, according to public records obtained by Marketwatch.