Last week an incident at Aberdeen airport in Scotland saw a DHC Dash 8 Q400 commuter airliner (empty and powered-down) roll unchecked across the hardstand, to run into an Embraer ERJ-145 parked on the other side. Total damage to both jets is likely to run into the hundreds of thousands of dollars.
The incident was captured by a security camera. There's no sound in this footage.
I'm still shaking my head at the sight of ground workers trying to physically stop the airliner by pushing and pulling at it. They must surely have been aware that, even empty, a Q400 weighs almost 20 US tons. How, precisely, is human muscle alone supposed to stop that sort of mass once it's rolling? What did they think they were going to achieve?
Verily, the mind doth boggle . . .