Photos: Notable countdowns tikker Notable countdowns — The Tikker watch counts down to your death. Happy days! Here are some other notable countdowns that are far less morbid. Photos: Notable countdowns Win McNamee/getty Final space shuttle mission — On July 8, 2011, Atlantis launched from Kennedy Space Center, marking the final mission of the American space shuttle program. Photos: Notable countdowns DOUG KANTER/getty Y2K — Everyone was scared that the start of the year 2000 would be rocked by computer malfunctions. However, Y2K really just marked the start of using zeros as glasses. Photos: Notable countdowns Bryan Bedder/getty Late Show Top Ten List — From the Ed Sullivan Theater in New York City, the Late Show with David Letterman is famous for its nightly Top Ten List. Photos: Notable countdowns Jason Kempin/getty Countdown with Keith Olbermann — Keith Olbermann hosted "Countdown" on both MSNBC and Current TV. Photos: Notable countdowns LEON NEAL/getty Great Guinness Toast — Clocks in pubs around the world count down every year to February 13 for the Great Guinness Toast, in which beer drinkers annually try to break the record for the largest toast.