After seeing a post on Likecool about gum stuck to the walls of Post Alley, under Pike Place Market in Seattle, I found that some people suffer from the impulsive urge to stick absolutely massive quantities of gum to stuff is not unique to Seattle.
First stop: Post Alley, Seattle.
Next stop: The Gum Tree at Ball State University
Next stop: Bubblegum Alley in San Luis Obispo, CA
Next stop: Penny Tree near the Lincoln Memorial in Washington, D.C.
… and if you want more flavor check out the Gum Stuck on Stuff Flickr Pool.