I'm relieved to learn this morning (through the power of the internet) that silicone breast implants
don't explode when a body is being cremated .. so that was another urban myth. Silicone burns just like any other organic matter. I used to feel bad for the crematorium staff about that before learning this.
edit:
What happens to silicone implants when cremated?
In a furnace,
silicone may burn up, but not the metal in implants – such as titanium or cobalt alloy. It is often separated from the ash and disposed of separately. Even tiny amounts of precious metals such as gold fillings can be discovered by waving a metal-detector over the ashes.