But as we have explored before , there are mental disorders that can mess with your perception of reality in unimaginable ways, while often leaving the rest of your mind untouched.

There is nothing we take for granted as much as sanity. No matter what "crazy" unexpected thing might happen at the office tomorrow, you still know that you're not going to show up and find, say, your boss replaced by a talking guitar.

6 Fregoli Syndrome

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Imagine you get into an argument with your asshole roommate about the unpaid rent. You need to let off some steam, so you call your girlfriend to see if she wants to go for a nice burrito somewhere, but for some reason it's your asshole roommate on the end of the line and he's calling you "honey." So you hang up and go outside, but your asshole roommate is waving at you from the neighbor's yard.

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Apparently Mr. Moneybags has enough cash for two rents.

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Furious, you go to the local bar, only to find that your asshole roommate is the one pouring the drinks. Ten minutes and two black eyes later, you find yourself getting arrested by your asshole roommate.

The Condition:

Fregoli syndrome is the delusion that some or all of the people you meet during the course of a day are actually the same person. It's named after a famous actor who was able to change costumes rapidly onstage. As you would expect, Fregoli sufferers are frequently paranoid, as they reasonably assume that some master of disguise is fucking with them. Or maybe some kind of shape-shifting wizard.

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Keep practicing, buddy. You can be James Hetfield, but you can't be all of Metallica.

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The disorder comes with different degrees of severity, though. Sometimes, sufferers don't know exactly who is stalking them, but everybody looks really familiar somehow. It's like waking up to find your town populated entirely by people who went to your high school that you never spoke to much. One guy was known to just walk up to everybody and ask where they'd met before.

Fregoli syndrome also makes for an interesting insanity stew when it tag-teams with other disorders. For instance, a woman who was diagnosed with the condition also suffered from schizophrenia and something called erotomania, the belief that someone is in love with you when they aren't. She believed that actor Erik Estrada was in love with her, communicated with her telepathically and disguised himself to show up in her daily life in the form of her acquaintances and current boyfriend.