In the programme I saw/heard (can't remember which) there was a woman who recovered from her transplant and found herself driving to a KFC, which she never used to do. It turned out the young man whose heart she had received had some chicken nuggets in his jacket pocket, and had therefore probably been looking forward to them when he died.

They said there is a cluster of nerve cells in the heart which is big enough to constitute a tiny brain, which is why, they think, that these occurrences are more common with heart transplants than with other organs.