Hell is Freezing Over Day
annually on January 31st
If you are in the Northern Hemisphere, it's the dead of winter, so it seems more likely that hell would freeze over now than at any other time. This is not necessarily a fun holiday, as on it you are supposed to do all the things you said you wouldn't do until hell freezes over.
"Not until hell freezes over" is an idiom of improbability from the early twentieth century, which stemmed from the belief that hell is a very hot place, and thus will never freeze over. There are many variations on the phrase, such as "It will be a cold day in hell when…" and "There's not a snowball's chance in hell…" Well, the unlikely occurred, hell has frozen over. Get bundled up and ready to celebrate.
How to Observe
Today is for doing all the things you said you'd do when hell freezes over. Did you say that you would join the gym when hell freezes over? Get ready to get in shape! Did you say that there's a snowball's chance in hell that you'd try anchovies? Get ready for a great meal! You are in luck if you've made similar comments about Brussel sprouts, as today also happens to be Eat Brussel Sprouts Day! Have you said it would be a cold day in hell when you went for a checkup at the doctor? Well, hell just froze over, so you better make an appointment. Do you have friends that often use the phrase "not until hell freezes over"? If so, you better let them know about the holiday, so they also do all the things they said they'd never do.