When I was young, I would often watch my mother make bread. I was particularly fascinated by the weird bubbly yeast - even more so when my mom told me the yeast was "alive". She told me we needed to feed the yeast with sugar and make sure the water wasn't too hot so that we didn't kill it. I became very concerned for the welfare of these little yeast creatures (especially because I knew they eventually ended up in the oven), so I asked my mom if I could keep some yeast as a pet. I think I watched my yeast pets do absolutely nothing in a bowl for a little while, and occasionally fed them sugar, but I eventually grew pretty bored with them.