National No Alcohol Day (10/2)
The World Health Organization came up with this one in 2008.

Quit for one day:  you may suffer a bad night sleep, be sweaty, blood pressure goes up and you’re just downright irritable.
Stop for a week:  Your liver begins to repair, you may lose a bit of weight and your skin improves.
Some people quit drinking for good.  Now they just drink for evil.  ;0)

PS: new science says you need 4-6 glasses of water a day, not the 8 you were taught in school.