The Morningstar is the whiny, nagging talking sniper rifle. She always whines when you get a critical hit or kill an enemy, nags when you reload, and annoy you when switching a weapon. For example: "Wonderful shot! Murderer!" (after killing someone), "You can't ignore me." (switching a weapon), "If you were a better shot, you wouldn't need to reload" (while reloading), and "You're a bad person." (got a critical hit).
Ah, that one I have posted already, actually. It’s under Objects, named “Guilt Gun” due to the file names.