Spontaneous human combustion (almost)

Yahoo! has a story about a man who built up 40,000 volts of static electricity in his clothes

“We tested his clothes with a static electricity field meter and measured a current of 40,000 volts, which is one step shy of spontaneous combustion, where his clothes would have self-ignited,”

I wonder if this is one possible cause of all those X-files-like stories of spontaneous human combustion?