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Dr. Stephen Colbert reporting for Good Morning America. Charles Gibson is the man on the seat throwing to Stephen (who he called "Steve") at Purdue University in West Lafayette, Indiana for the 9th Annual* National Rube Goldberg Machine contest. Gibson just asked Stephen to explain what a Rube Goldberg machine is.

Exact date unknown, however, according to the Purdue website, the contest was revived in 1983, putting the 9th annual at 1992.

Screengrab from: Good Morning America, Copyright © 2007 ABCNews Internet Ventures