Fifty-five foot Scooby-Doo balloon greets fans at the Second Annual National Family Pack Walk at the National Mall on Saturday Sept. 29, 2012, in Washington. (Photo by Larry French/Invision for Warner... more 
Fifty-five foot Scooby-Doo balloon greets fans at the Second Annual National Family Pack Walk at the National Mall on Saturday Sept. 29, 2012, in Washington. (Photo by Larry French/Invision for Warner Bros. Consumer Products/AP Images) less 
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Associated Press
Sat, Sep 29, 2012 7:03 PM EDT