They used to use a mercury switch in children's shoes to make them light up. I think in the 1994 or something, they stopped doing that and used something else, but not sure if they stopped it completely or not and do not know if all countries stopped it. I'm sure many of the shoes still have the mercury switch.

I know my neice and nephew had light-up shoes at one point and now I wonder...

IT's not just the effects it can have at the time, it's also the fact of what happens when the shoes wear out or need to be disgarded? It becomes toxic waste and how does one expose of it? This is what they're doing. Making mercury part of so many things and then causing further toxic emissions to the environmnet.

well yeah one could get paranoid about it (OCD) lol, very easily and hey you're right, it is a mercury symptom afterall <img src="/ubbthreads/images/graemlins/wink.gif" alt="" />