My favorite are people who label themselves as "plant people" and kill anything they touch. There is always some convenient excuse for the latest victim(s).
I have someone like this at work. She 'borrowed' a plant that has been growing by a windowsill for the last 10 years with high light to 'care' for it and placed it in an office with no windows...can we guess what will happen?
It's just really sad because this plant went from a little tiny thing to a full and very robust tree like plant. Now, it doesn't have a prayer.