Foo Fighters almost made David Letterman cry. Just how rare is that? (VIDEO)

David Letterman got emotional during his show on Wednesday night, quite notable because the unflappable late-night host is generally as dry and cynical as you get. The culprit: A Foo Fighters song. Letterman is a big fan of the band, which is performing on his show every night this week. In a Web-only performance, Letterman shared a sweet story about his connection with their song "Miracle": Feeling self-conscious about being a 60-something raising a preschooler, he searched for an activity they...