Disaster ~ Pure Stupidity

Being a crafter, and an experimental one at that, I am prone to having the odd disaster, but my latest is of epic proportions.
I am currently making papier mache bowls for Christmas and this morning I started to make another batch.  For the first layers I use upturned bowls and layer paper strips over them for a couple of layers before I bake them in  a low heat oven to dry out.  Then I make a clay paste papier mache and coat the outer layer on.
So I got out my plastic bowls and covered one huge mixing bowl and two smaller cereal bowls with paper strips.  I use plastic bowls as they are flexible and removal from the formed shape is easy.
I bunged them into the oven and didn't really think about the temp.  Normally it's on a really low setting,  I was so excited at nipping over to the shops for gold spray paint and doilies that I forgot.
I have been unsuccessful in my doily hunt and got talking about crafting to several people and forgot that my bakes were in the oven.
When I came back in I thought, oh lovely they'll be dry by now, and they were, but each one of the paper forms was empty and on the floor of the oven there was a huge pool of melted plastic and to make it even worse it's stuck all over the oven shelves too.  The bowls had completely disappeared.