This past weekend, a LEGO store in Portland had a Hulk building event.
This was one of those events where participants put together smaller subunits (bricks made of bricks) and then those get put together by the LEGO pros to make the full sculpture. I don't know if they tear these things down right away, or leave them up on display for a while. If you're in Portland, stop by the Washington Square Mall LEGO store and you may see this. Here's the final result. I'm pretty sure the smaller version was made in advance as a template for assembling the big guy.
BTW, it looks like participants got a commemorative Duplo brick.