Fat Man Fallout.

[retrolinkx]

http://www.youtube.com/watch?v=SFGNdfBjhGQ

In Fallout 3, and New Vegas, a weapon can be found called the Fat Man, a Tactical Nuke Launcher.

When you fire it, it throws a mini nuke ahead of you at the enemy. When you reload you hear a "ding" sound to indicate it has finished reloading.

The bell heard is actually the Bethesda lunch room bell.

http://fallout.wikia.com/wiki/Fat_Man_%2...the_scenes

DYKG Edit: Source http://www.gameinformer.com/b/news/archi...dbits.aspx