Maybe it was connected to a motion sensor.
"Syndrome"
Thomas Hoover
And the next time, Dan, I advise you, as you never suspect anybody yourself, to consult with somebody who doesn't take people for what they seem, and not to let yourself be flattered out of your sensor, even if you see your father is."
"April Hopes"
William Dean Howells Last Updated: February 27, 2009
This sensor stands in the middle of a very steep hill, called Nakhil Sammar, on the top of which is a great castle, in which the governor of the province resides, who is an Arabian; these craggy mountainous countries being mostly governed by Arabians, as the inhabitants of the mountains cannot brook the proud and insolent government of the Turks.
"A General History and Collection of Voyages and Travels, Vol. VIII."
Robert Kerr