I was listening to the radio in the car today. A listener called in and had an interactive conversation with the host. A listener he said a lot of  "you know" for each sentence. I guess he maybe said "you know" more than 20 times in about 3 minutes. 

I remember that a tutor used to say "you know" a catchphrase too.

One time, "You know...you know...you know...something...you know," he said, then he asked me.

I replied :"I don't know, you know"

The teacher and students all were laughing in class.