When I was a child, me and my nephews (which are about my own age) used to go to the pharmacy to buy thermometers, and break them for their mercury. With time we accumulated enough to fill up a mid-sized crystal jar, I would say around 200 grams.

We played with that mercury a lot. We passed it between our hands, which later held treats we ate. We laid down on the grown, and pour it in our closed eyes, letting it drop on the side of our faces. The only thing we came short of doing was putting mercury in our mouth. No harm ever came to us as a result.

I would have cleaned the spill for free, if I get to keep the mercury. ;-)