What happens if a person falls into a volcano?

http://www.youtube.com/watch?v=kq7DDk8eLs8

This video shows what would happen (to some extent) to a person if they fell into a volcano. It is depicted in films and tv that people sink and melt... well in fact this video shows that if an object made of organic matter falls into a lava pit it in fact... explodes. This is due to our bodies being made mostly of water and this then rapidly turns to steam which explodes out of the casing and causes a small eruption. This bag only weighed 30kg so imagine if a fully grown man fell in... how big of an eruption would it be!? There is some more detail in the comments box if you want but just thought this was interesting and quite cool to watch (no pun intended).

Thanks,

Vinny