The 1st segment is about a dog who keeps following a barber, the 3rd about a mother who likes to watch her son and his wife while they're having sex, the 4th kind of wraps them all together.
But the best is the 3rd, with Bruno Ganz. This is one of the best things in cinema terms to ever come out of Europe, its 20 minutes are nothing but brilliant. It's about an older man who gives a ride to a beautiful and innocent young woman and her stupid male friend. Great story.