Welcome, erzsebet. I've never heard of your custom, and like Maverick, I'd like to know what country you're in.

In the Southern US, my family had a superstition: on the first day of the month, the first words out of your mouth had to be "rabbit rabbit." (no, Mav, not rarebit ) If you forgot, you had to do something nice for mom or dad or a sibling so as not to bring bad luck down upon the house. We didn't take it seriously, of course, and mom would always hope at least one of us would forget so she'd get an extra chore done.