Uma Thurman made an appearance on Monday night's The Late Show with Stephen Colbert, where the host brought up Thurman's missed opportunity to star in the Lord of the Rings trilogy. Years ago, the Kill Bill actress had passed on playing the role of Eowyn (which eventually went to Miranda Otto) in the lucrative Peter Jackson franchise. "I would've played Eowyn in The Lord of the Rings," joked Colbert, a big fan of the franchise. "It was a very long time ago, and I do…