It’s bad luck to get your hair cut on a Wednesday. Some barber shops actually close on Wednesdays for this reason.
Don’t smell the flowers you are offering to a monk or for Buddha. If you do, something bad will happen to your nose.
Don’t stomp your feet in the house because it will scare the house spirits away and the house will be left without protection.
Don’t eat while lying down because you will come back as a snake in the next life.