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June 30, 2015

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In this photo released by CBS, author and fitness personality Richard Simmons, left, reacts to an explosion under the vegetable steamer as host David Letterman watches from the rear, on the set of the "Late Show with David Letterman" Wednesday, Nov. 29, 2006 in New York. This was Simmons' first appearance on the show in six years.

CBS, J.P. Filo / AP

In this photo released by CBS, author and fitness personality Richard Simmons, left, reacts to an explosion under the vegetable steamer as host David Letterman watches from the rear, on the set of the "Late Show with David Letterman" Wednesday, Nov. 29, 2006 in New York. This was Simmons' first appearance on the show in six years.