Several months ago now I bought a bunch of fresh rosemary to use in some cooking. Seeing as how I paid for a bunch but only needed a few leaves I put the rest in a glass with a little water, hoping it'd keep for a while so I could use more. After a week I realised those sprigs hadn't died. After a few months I noticed this:
Look at those roots! This sprig was doing far and away the best - the other two ended up dying. Well now this little guy has his very own pot outside my front door, and so far (touch wood) he's doing well. I've also managed, somehow, to keep some basil and some flat leaf parsley alive on my windowsill. I think there's a large element of luck involved with those, though.
I really do love the types of plants that even I can't kill. My front yard is full of them. Which is a good thing, since I'm the angel of death to all things green and leafy!