I myself am not superstitious, but many people here in Romania still are. Some of the big ones include:
- if you go back inside the house after stepping over the threshold you'll have bad luck / things will go badly for you. I've met people who get really ridiculous about this one, even if you're the one to go back inside the house, they'll say you've cursed them all.
- when someone tells a person or animal on the street that they're beautiful, they'll often also say "să nu te deochi", no direct translation into English but it means "not to harm their health because you admired their beauty". The person or animal that was admired has to wear something red to ward off the curse.
- breaking a mirror brings 7 years of bad luck. I've also heard this in American movies. Let me know if you also have this one in your country.
- if you put your clothes on inside-out, the weather will change