A Car Seat’s Headrest
Headrests adjust to make a driver or passenger’s head a bit more comfortable. But a headrest can also get pulled out completely. This will reveal two long metal bars with a dull point which were designed to break through a window in case of an emergency.
An Airplane Window’s Holes
Those tiny holes in an airplane window regulate the pressure difference between the interior and exterior of the plane as it ascends to the sky. And it keeps the windows from fogging up, so you can enjoy the view. But don’t worry. The holes won’t make the cabin depressurize.
