Holy cow, I wrote a book!
During the Windows 95 project, the window manager team
stayed late one night and redecorated the lobby.
They suspended a variety of Hallowe'en-themed objects from
fishing lines: spiders, ghosts, witches, jack-o'-lanterns,
that sort of thing.
The fishing line went up and over pulleys, rigged so that
the objects spookily
rose and fell seemingly of their own volition.
It was quite an impressive display.
The fishing lines were anchored to
various doors in the building.
Since the doors they chose were highly-trafficked,
this assured a random pattern of motion for the objects
suspended from the fishing line.
Of course, no spooky Hallowe'en display would be complete
without a spider rigged to the front door,
rapidly descending upon the poor victim coming in for a meeting.