Well, what's this?

I am so haphazard with my planting and my weeding that I occasionally get surprises. The leaves on this plant or so shiny I decided not to pull it out and I am glad that I did not. However I do not recall planting such a thing or though I may have thrown seeds out and I have no idea what it is. Which is pretty much common for me when it comes to my plants and my yard.

Anybody know the answer to that?