I was looking over the Kopaka Nuva Phantoka review to figure out what white pieces I had for an MOC I'm working on (more on that later), and I remembered something. There was a line that said:

Warning: Toa may melt if in sun for too long.

Now, this reminded me of something that happened quite a while ago;

I don't suppose you remember the strange plastic that was used for Tahu Stars' Hau? Well, I left it under a lamp...

And the rest is pretty much obvious. What did it do but go off and melt. There's a sad memory.