Who Works During the Holidays?

While sitting here at my computer, plugging away at tending the bin, I started wondering who else might be hard at work, instead of enjoying what most in the world (especially in America) would consider "the Holidays". I've stumbled into working this season for the second year in a row, and I find myself not bothered much by it at all. If you had asked me even 5 years ago if I would give up my Christmas vacation for work, I would have laughed and answered with a resounding "No!". Have any of you fallen into similar behavior? As an aside, what Holidays do many of you find yourselves working, whether it be Christmas, Thanksgiving, or some other Holiday, what drives you to work when others are enjoying their time off?