Oprah's talk show may be long since ended, but on Tuesday night, she became host once more when she stole Stephen Colbert's chair mid-interview. In fact, she flipped the entire interview on the CBS host.

During an emotional appearance on The Late Show on Tuesday, April 7, Oprah Winfrey surprised host Stephen Colbert by taking his seat to conduct a "role reversal" exit interview as his tenure nears its...