The best thing about this supplement is the inventiveness of the monster descriptions. Even though I will be using these monsters in a campaign run using a completely different RPG system, the descriptions are enough to make the book worthwhile for me.

I also liked the fact that not all of the "monsters" are killers, some are helpful - which makes a nice change of pace.

Only one small negative - the text of Bad Beer states it drowns its victims, but the image shows an acid effect.

This short supplement consists of two parts. The first part explains what a spontaneously generated monster is and where/why they occur. The second part provides several examples. This can be an excellent resource for GMs looking to surprise their players.

A lot of really neat ideas for monsters in here, and a bunch of Andy Hopp's awesomely bizarre artwok!