Hmmm, well I think there is some pretty wierd stuff out there, and honestly Spontaneous Human Combustion isn't one of the odder things I've heard about over the years. At a time when we're finding out that Einstein might have been wrong about physics (if CERN is to be believed) I don't think there is much that should be immediatly discounted.
The way I look at this is warped to some people, because I'm fairly rational for the most part. I believe that blaming the paranormal/supernatural for things is ridiculous because the odds of running into anything like that is minimal. 99% of what people believe is an occurance like that is something else. On the other hand there are cases where we've literally thrown every expert we can produce at something and found no real satisfactory answer, even if some people believe they found one, or have a solid theory.
Ghosts are ridiculous right? Well consider that legally speaking they exist. In most of the US there is a requirement that people have to be informed by a realtor if a house has a "history" due to people literally buying haunted houses blindly and then having all kinds of messed up stuff happen. If the legal system has been forced to acknowlege the existance of haunted houses after many years of dealing with the reports, it makes you wonder what else there might be out there.
It was decades ago when I took Criminal Justice, and I'm being simplistic, but I was a bit surprised when I found that little tidbit out, since I guess it's not really well publicized.
Spontaneous human combustion has apparently been documented for centuries, and does not always happen when someone is alone. While I'm sure there have been explanations missed in a number of occasions, I don't find it any more ridiculous than some guy winning in court against a real estate agent because something went "bump" in the night really loud and convinced him to do research and found out that people died in the house.