Highlights from the world of Stephen and his guests include a dance-off with Rain, advice from Karl Rove, and a chat with an astronaut in space. (04:39)
The outspoken country music artist speaks with Stephen about the Colbert Bump on iTunes and the mutual benefits of being friends with each other. (4:35)
Stephen and Willie Nelson sample each other's ice creams for the first time. Willie enjoys Americone Dream and Stephen accepts an unspoken apology. (5:06)
Once wasn't enough -- Stephen pays additional tribute to the 20th anniversary of Reagan's "Tear Down This Wall" speech, with the help of karate champion Igor Dyachenko. (0:49)