I thought of two more superstitions that my mother repeated regularly:
Sing before breakfast, cry before night.
I always wondered how my Catholic friends finagled this on Sunday, since I knew they fasted before going to Mass, and then would be singing hymns during the service. Did every Catholic kid I know cry on Sunday evening? Probably.
Don't tell a dream before breakfast, otherwise it will come true.
I still subscribe to this belief, actually.