It's a bit hard to see in this photo, but this was a "double tulip" that bloomed in our garden a few years ago. This was taken on the OLD digital camera, so pre-2005, probably spring of 2004 but I forgot to check the date on the photo and I am being lazy right now.
This was not one of those fancy double ruffly type tulips, but two flowers coming up off of one stem. The stem split apart about 4 inches below the flowers, but from there down it was fused into a single stem. There was not even really a seam or ridge in it -just a single stem splitting into two flower heads.
Never seen anything like it. And it's never happened since.
Of course this tulip was right off the driveway - so who knows what kind of "run off" it was fertilized with.
At least it did not glow in the dark. Now THAT would be interesting!