Zen, I saw one where the guy bolted upon seeing Chris Hanson and they grabbed him back into the set anyway.
Anyone see the famous episode where the teen decoy tells the pedo to help himself to some freshly baked cookies, Chris Hanson comes out and announcing he's from Dateline...the whole spiel, and the guy is still on the couch eating the cookies!!
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"What I do know is that if Karen Carpenter and Mama Cass Elliot had shared that sandwich they'd both be alive today." -Michael K