Constantly forgetting your keys when you go out the door? You need this hanging reminder and organizer for the doorknob: http://www.containerstore.com/browse/Product.jhtml?PRODID=10015871&CATID=64182 - via Lifehacker
yeah, i saw this during my online holiday shopping last month. but many places were out of stock.
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Not advisable for use on doors with windows, hahahaha.
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