Mad Cow disease. One or more of your characters have contracted the disease and it's your job to write a scene from 3 different perspectives.
The first is from the perspective of the character infected.
Second, from the perspective of one of their companions that may or may not be with them in the scene.
Third, an omnipresent perspective, meaning in third person.
To be clear, this disease has no cure. Here's a bit of information for you that should include symptoms and how the disease can come about.
http://kidshealth.org/teen/infections/bacterial_viral/mad_cow_disease.html