If you spilt salt, you throw some over (I think it is your right shoulder) to prevent bad luck. If you get something in your eye, you can blow the opposite nostril while keeping that eye closed, and it will come out - Ha Ha.
Also breaking a mirrow - 7 years bad luck. My nan was full of them, but she was Irish - maybe thats why. She often used to say "Gor do's me" I never knew what it meant - does any one else know where it came from.
Poor old Nan, a wonderful person, and has been dead a good 30 years now, but her memory still lives on.