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.
Nausea Fuel: Even if first-person shooters don't usually give you headaches or upset your stomach, this one might.
There's nothing quite like watching your character vomit (twice) into a toilet from his eyes.