I don't have one and I am glad that I don't but believe sixth sense does exist.
I was having girls talk over dinner one night with my friends since college. When we were around 20 y.o, we used to say about future bf/husband to be good looking, tall, stable job, fashionable and all materialistic things. But after we passed 30, one of us said "Now I set my bar lower. My condition is someone who doesn't have a sixth sense! You don't want to live with somebody who all on a sudden casts a glance back over for nothing while eating, do you?" ....true though.
She is a high school teacher for handicapped children. There are DS children, muscular dystrophy, autism and other menntally or physically handicapped kids all mixed in a same classroom but she says there is certain moments only autistic kids stare at the same spot. One of them doesn't talk, she only says mom when she sees woman and dad when she sees man. One day, she found my
friend in a hall way, she said "mom!" After she held her, she looked her back and said " Dad" while there was nobody behind her. Isn't it scary?