If that's the case then my local coffeeshop has over 300,000 drinks because they sure as hell have way more modifiers than Starbucks.

Jack Angel's case has been debunked. There's more info on it in this article: http://www.csicop.org/si/show/not-so-spontaneous_human_combustion/

But long story short, in 1975, he claimed to have been sprayed by scalding water after trying to repair his motorhome's water pressure.

Spontaneous Human Combustion is an interesting notion, but most times there is a completely valid explanation (whether you want to believe it or not) or it is a hoax.