This is because I had a sudden inspiration, but Danny phantom au where the portal was never actually made public(I'm thinking because it's actually very much illegal and stuff) and so no one was there to witness the portal accident.
Meaning, for the people that do know that Danny is Phantom, don't actually get the context for his death and they won't instantly think of an inter-dimensional tearing a hole into this boy, and from the very limited information, Danny shares about his death. They think of the most bat-shit crazy reasons for Danny's death.
I'm thinking of a post-reveal thing, where Danny just has the craziest rumors, ranging from the stupidest to the most gruesome reasons for his death. All while he just sits in the corner watching people have a heated debate on whether or not Danny died via electrocution by microwave.