The main departure lounge of Vienna Airport is spread along a terminal with glass front overlooking airplanes parked along their various gates.  It is not possible to walk up to the glass front because it is separated from the lounge by another glass front about 1.5 meter away.

An unfortunate woman stood up with iPhone in hand and walked to the glass front to take a picture of the parked planes and knocked herself out walking into the inner glass wall.

As most people would react in situations like this, the poor woman was torn between acute embarrassment and painful concussion.