Mike: What's the strangest thing you ever grew from a seed?
Luke: Heh heh. You don't wanna hear the answer to that question.
Mike: I mean other than drugs, of course.
Luke: I grew an Avocado one time.
Mike: Out of the stone?
Luke: Yeah, but I never worked out how to get them to grow really big. After a while they all seemed to just die back.
Mike: Anything else?
Luke: I've got little grapefruits, oranges and lemons going, but they never amount to much either. I don't really have the best conditions. But the best I ever managed was out on the stairwell one time.
Mike: On the stairwell?
Luke: Yes, I came home needing the bog, like, urgently. Then I discovered I had left my keys in the locker at college. So I just had to crimp one out and the only place to do it was in the pot of this yucca plant that actually belonged to the neighbour. 
Mike: You crapped in your neighbour's plant pot? 
Luke: Yeah. Well, I couldn't just go back to college leaving this sticking soft shit on view in my neighbour's plant pot so I managed to cover it over with soil from another pot and hide it. 
Mike: And she never found out?
Luke: I went to get the keys, came back. There was a slight smell and I opened the windows, thought no more about it.
Mike: And what grew from that then, a shit plant?
Luke: Nope, a few weeks later a lot of tomatoes started to appear. The funniest thing about it was the neighbour took it all at face value and just harvested the tomatoes and ate them when they appeared.
Luke grew an avocado out of the stone once. He also grew grapefruits, oranges, lemons. Once he shitted in a yucca plant pot belonging to his neighbor and he covered it with other soil. Then tomatoes grew out of the pot and the neighbor ate them.