I was making quacamole just now with a couple avacados that T's husband gave us at work a while ago. I opened one that was WAY too ripe to use, but noticed the pit had a tiny root already sticking out of it! So, I took it out and put it in an empty pot with some potting soil, watered it and am hoping I will one day have my own little avacado tree!
P.S. the guac was delicious!