This isn't from the '70s, but I'm kind of short on ideas. I had a dream where I was in a restaurant, and the waitress came to my table with my order. I told her the fries didn't look done well enough, so she said "Let me see." She reached down and took one of my fries and ate it, and said that she thought they tasted okay. Then she took my fry basket and handed it to the person at the next table and asked his opinion. And the next thing I knew my fries were being passed around from table to table and everyone was eating my fries. I started to complain and the waitress turned to me and gave me a dirty look and told me that she thought I had a rotten attitude.
