What is it?

I cannot, for the life of me, figure out what this is. I'd love to be kinda specific when keywording, so any help would be lovely.

My books and even Google have failed me....(I've got seedpod nightmares now!)

Thanks!



Here it is in context:

Hello,
Try to ask in "Home & Garden" category on http://answers.yahoo.com/ - and supply few photos from your videos - there are many pros ready to help. They helped me many times finding right names of my plants.
Zygis

OK, thanks, I will! Funny that several local gardener types don't know what this is, except that one says he cuts it before they become annoying burrs....

It looks like a thorn bush.