I'm not Jewish, but the Hebrew observances have always been interesting to me. Perhaps it is due to the importance of the Hebrew history in the Old Testament to the belief system I grew up in. Of course no one can forget Joel's memorable Yom Kippur in Northern Exposure (6-03).
Yom Kippur is the Day of Atonement, when believers observe a 25 hour fast and repent of their sins against God and man from the previous year. Granted, it might be good to worry about how you treat other people more than once a year, but on the other hand, better once a year than never at all.
I won't begin to fast and pray at sunset, but there's no harm in giving an extra moment's thought to how I stand with my fellow sojourners.