There's a new watch hitting the internet shelves called the Tikker. Enter a few personal characteristics and the Tikker will calculate, keep track, and visually display how much time you have left to be alive.
Various studies suggest that constantly staring your mortality in the face can have different effects - some agreeable some not so agreeable. Apparently people may become motivated, kinder, more productive and therefore more satisfied with their existence. They may also become Xenophobic. Blog discussion HERE.
If you were given a Tikker as a gift - would you wear it?