During a March 21st edition of CNN Headline News, a fire broke out in the studio just above the heads of the two anchors, Chuck Roberts and Linda Stouffer. You can hear the hesitation in Roberts' voice as he narrates a series of video clips, and then when the shot goes back to the two anchors, an electrical fixture blows up above Stouffer's head while she is on camera.
http://www.youtube.com/watch?v=_NXASAv0klA