/usr/share/applications/screensavers/pong.desktop is in xscreensaver-data-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=Pong
Exec=/usr/lib/xscreensaver/pong -root
TryExec=/usr/lib/xscreensaver/pong
Comment=This simulates the 1971 Pong home video game, as well as various artifacts from displaying it on a color TV set. In clock mode, the score keeps track of the current time. http://en.wikipedia.org/wiki/Pong Written by Jeremy English and Trevor Blackwell.
StartupNotify=false
Terminal=false
Type=Application
Categories=Screensaver;
OnlyShowIn=GNOME;
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