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No Time-Traveling Dogs Were Harmed In The Making Of This Comic
Posted December 14, 2007 at 7:24 am

Usually if I think of time-travel gags involving fictional characters - or if the situation would require that time-travel be made public - I'll do them as a dream sequence. Especially with the fact that this trick takes place before a live studio audience (where David Letterman does his show in the same place that Ed Sullivan did his).