These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
YMMV: Osmosis Jones
Complete Monster: Thrax, a sinister virus obsessed with fame and breaking records in the medical books. To this end, Thrax infiltrates humans and sees how fast he can murder them. Upon arriving in the human Frank, in whose body most of the film takes place, Thrax sets about gruesomely murdering whoever crosses his path, while making Frank sicker and sicker. This has the benefit of killing not only Frank, but every being living within him. Thrax even threatens the titular protagonist, Osmosis Jones, that after Frank is dead, Thrax will gladly go and break his new record on Frank's young daughter.
Narm: Uncle Bob's reaction to Frank getting hospitalized. His "crying" honestly sounds like hooting laughter.
Nausea Fuel: Most of the movie. Also, the scene with the zit.
Nightmare Fuel: Frank starting to die, both from his perspective and perspective of the inhabitants of Frank City.
For that matter, Red Death. He's killed several people before by stealing a part of the hypothalamus that controls body temperature, showing off a piece of jewelry with several of these bits. The thought of having a sudden, uncontrollable fever that will only go higher as time passes by...
Not that he didn't deserve it, but Thrax finds out the hard way that alchohol is like sulfuric acid to germs. Ouch.
Nope. Most viruses don't go "latent" in the body - they're summarily ejected. When you get over the flu, that flu virus is gone for good (since you are now immune to it). The two exceptions are retroviruses (HIV is the best known one) and herpesviruses (chicken pox, cold sores, etc.) The herpesviruses are so ubiquitous, they'd probably end up citizens of the body, albeit somewhat sketchy ones...
Frank picks up a hardboiled egg and eats it. What makes this Squick? The egg has been on the ground in a filthy chimpanzee cage, and before that it was IN THE CHIMP'S MOUTH. Maybe all his unhealthy habits were affecting his brain?
It's more like the thing running his brain affected his unhealthy habits.
A horror film playing in Frank's movie theater (i.e. a nightmare from his subconscious) involves his daughter marrying his brother.