Wow, what a fun billboard! Leo Burnett Chicago created this huge egg billboard for McDonald's, it only opens up between 6am and 10.30am, the time that eggs are on the menu at McDonalds. Click on the image to get the full transformation (and larger) view.

Kudos:
John Montgomery (Executive Creative Director)
Brian Shembeda (Creative Director/ art director)
Avery Gross (Creative Director/ writer)
Nathan Zuercher (Art Director)
Adam Rubin (Copywriter)
Laurie Gustafson (Producer)
Denis Giroux (Producer)
Props: Prop Art Studio
I love it, that's a really a nice billboard.
I like it too. For more reality effect it should slam shut on the dot when they stop serving eggs. Remember D-Fence in Falling down. ;P
Ps - via adfreak and adrants - Suntimes article about this billboard.
Could be another Cannes winner, just like fresh Salad.