Which project did you get in early on?

And by early I mean at a point where a relatively small investment would today be worth a figure with an extra 1/2/3 zeroes. It doesn't have to be one which you held onto until it reached such a point, or one that you still hold: just one that has since your original investment had a drastic rise and is now at a point where a doubling is going to take some time to achieve - or even one which has at some point met that criteria but which now might be long gone.

Obviously many of us have known of projects for a long while and not invested a thing, watching them rise through the gaps between our fingers; I don't mean those situations. I mean: which project did you have faith enough in to invest when such an action was a considerable gamble? One which has since flown.