Which is typically staged, with costumes and sets

Possibly a play? Plays have costumes, staged actions, and sets! Hope this helps :)

Generally spontaneous human combustion is something that still bewilders some, human combustion happens very rarely and doesn't affect the surrounding areas, so unless you want to set your self on fire, human combustion will remain spontaneous and very rare.

Net  the suffix is your .com/.net/.org, and so on, i believe