We rely on our senses to provide us with vital information about the world around us, helping us avoid danger and allowing us to enjoy the sensory pleasures that surround us.
This sensory information tells us when something smells good or when it literally smells like crap, but people who suffer from troposmia think everything smells foul- because their minds perceive a bad smell that's not there:
Troposmia messes with your sense of smell, and in a cruel twist, it almost exclusively makes odors worse. Not much is known about the condition (we can't even settle on a name, since it's also known as parosmia), but what's certain is that it blows. In some cases, the distortion is uniform -- everything smells, say, musty, as if your grandparents' garage had extended into the entire world. Other times, all the smells are wrong, but uniquely incorrect, such as bananas smelling like trash, bread smelling like paper, or roses smelling like shellfish.
And since smell is a huge part of enjoying a good meal, troposmia can mess with the way food tastes, too. Outside of the broad flavors like sweet or sour, more delicate distinctions are processed through our nose -- we "taste" garlic, citrus, and the like by smelling them.
Our senses also inform our thoughts, feelings and emotions, and when those poor folks who suffer from cataplexy feel a strong emotion their body falls like a puppet whose strings have just been cut:
Cataplexy usually comes as a combo package with narcolepsy, but it can also manifest on its own. The body-freezing attacks, while brief, can make life difficult for sufferers because they're triggered by strong emotions. Laughter is a common one, which can turn you into a bit of a buzzkill in social situations (unless your friends are especially terrible). Sex, terror, crying, and embarrassment make it happen for others, which in our experience could lead to an endless loop. If you refuse to believe this is a thing, there are plenty of examples on the internet.
Read 7 Freaky Ways Your Body Can Flat Out Betray You here (NSFW language)