putting anything over the i or j except a dot - circles, loops, hearts, teardrops, crosses... all common.
wearing a lot of make-up.
large ear-rings.
putting on make-up in public. particularly common are women who refresh their lipstick at the dining table.
speaking loudly in a public place.
drawing attention to yourself.
asking questions of someone of a higher social rank than yourself.
making personal remarks inappropriately - for example, an adult may say to a child 'you look lovely' but a child may not say that to an adult. it would be 'common' because it would display a lack of understanding of good manners.
anyone who phones in the evening. some say after nine - i say after 7 30.