This such a great concept.  Photographer Irina Werning takes old photos and asks the people in them to recreate the pose now. I really wish I could come up a photo concept like this one:

Back to the Future

This one is so sweet:

This one is kinda funny (and a bit disturbing-thinking back to bathtime with my little brother- GAH!-there's no waaaaay I'd recreate those moments - not enough therapy in the world for that!!!):