Outofstock is a Barcelona-based design company that has attracted talent from all over the world. At IMM Cologne 2010 Outofstock helped new furniture design company Foundry by presenting some of their work. Among their pieces was the Rack Your Brain coat rack.
The Rack Your Brain coat rack looks like a piece of wood hung on the wall. That is, until you realize that you can pull out pieces of the wood and hang your coat up on it. The design is clever, and you could certainly make guests rack their brains trying to figure out how to use it.