4. National Open an Umbrella Indoors DayWhen: March 13Openning an umbrella indoors is generally considered bad luck, but what this national day suggests is … maybe it’s not? You know, that’s a risk I’m not willing to take. I don’t need to open an umbrella indoors, walk outside and then get hit by a falling space toilet or something all to find out that, yep, turns out that’s bad luck. Between a lung collapse, a blown appendix and a diet that most doctors call “disrespectful,” I’ve tempted fate enough. I don’t need to give it a helping hand.