Many years ago, when some neighbors moved away and their house was vacant for a few weeks,

Many years ago, when some neighbors moved away and their house was
vacant for a few weeks, my brother installed an extra doorbell in
the basement, and ran the wires out along the rear sidewalk,
terminating them under a flagstone tile by the alley. After the
new neighbors moved in, if he was coming home late at night (1 A.M.
or later) he'd stop by with a lantern battery and connect it up to
the wires. After about 20 seconds you'd see the upstairs bedroom
light come on. Another ten seconds later the hall light would come
on, then a few lights on the first floor. At this point he'd
disconnect the battery and go home, and not repeat it for a couple
of weeks. He continued this for a couple of years.

He had also installed a loudspeaker in the attic, running the wires
outside, but either they found that one, or the wires broke, so he
never got to use it.