/usr/share/applications/screensavers/boing.desktop is in xscreensaver-gl-extra 5.30-1+deb8u2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 | [Desktop Entry]
Name=Boing
Exec=/usr/lib/xscreensaver/boing -root
TryExec=/usr/lib/xscreensaver/boing
Comment=This bouncing ball is a clone of the first graphics demo for the Amiga 1000, which was written by Dale Luck and RJ Mical during a break at the 1984 Consumer Electronics Show (or so the legend goes.) This looks like the original Amiga demo if you turn off "smoothing" and "lighting" and turn on "scanlines", and is somewhat more modern otherwise. http://en.wikipedia.org/wiki/Amiga#Boing_Ball Written by Jamie Zawinski.
StartupNotify=false
Terminal=false
Type=Application
Categories=Screensaver;
OnlyShowIn=GNOME;
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