Let's make it clear: Having a mental disorder is no fun. Even if some of them kind of sound like fun.
For instance, there is a whole list of mental disorders that basically turn your life into a live action Hollywood movie.
7Capgras Delusion - Your Friends are Body Snatchers
There's no one you can trust. Everywhere you look, faces that look familiar stare back with alien emptiness. In the movie Invasion of the Body Snatchers, humans are replaced with identical alien pod people, making it impossible to trust anyone, stoking paranoia and giving Donald Sutherland an excuse to sport an exquisite sex offender mustache.
If you have the unwavering belief a loved one has been replaced with an impostor (and you don't have the pimp mustache) you're probably dealing with Capgras Delusion. Besides being the name of band you were in while at community college, Capgras Delusion is brought on by that Molotov cocktail of brain disorders: schizophrenia.
The alleged impostor can sometimes be perceived as a threat or simply as a docile stranger who just happens to look exactly like your spouse and inexplicably wants to live their life. While most Capgras patients decide to live with the impostor, some rebel against the perceived takeover and try to fight it. They can become so paranoid that they even believe they themselves have been "replaced."
The question is, if you think you've been replaced, why were you not replaced with a fitter, more well hung version of yourself? We mean, as long there is a pretend "you" running around, that pretend "you" might as well get pretend laid more often.