The leap second, necessary for keeping Earth-based atomic clocks in sync with the not-as-reliable rotation of the Earth, is considered a nuisance. A vote at the World Radio Conference in Geneva will decide its fate.
The leap second is an interesting catch on WWV and WWVH, with special voice announcements and, of course, one more or one less second in a given minute.
Read more here:
• Changes to the world's time scale debated
• Leap second (Wikipedia)
• NIST radio broadcasts