My JW mother is very superstitious, but plays it off as just being something her mother would say. I would hear things growing up like:
"Oh, a bird just flew into the window, my mother always said that means someone will die."
"I just took a chill. Mom always said that meant someone was walking over your grave."
If you call her on it, she will deny that she is superstitious, but she gets obviously upset when a bird flies into a window.