This story from the BBC reminded me of something similar that happened to me a few years ago. An old couple who bought a plant at a car boot have managed to grow the largest Cannabis plant seized by Beds police! My mother managed the same feat but, according to her, the seeds must have grown form some bird seed she had thrown out:
Perhaps the first time that someone has ever had to complain that their mother was growing Cannabis plants?? If I had come up with the same story, do you think my mother would have been quite so understanding?