Castle fans got a great treat last night when leading man Nathan Fillion was interviewed on the Late Show with David Letterman. The two chatted about Nathan's interrupted career path (he'd been in college to be a high school teacher when his big acting break hit) and being mistaken for Jason Bateman.
Watch Nathan Fillion on Letterman
Here's a clip of Nathan and Letterman speaking, loving the interaction between them:
center|400px|Nathan Fillion on David Letterman
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