Surely you know someone that's a "like" overuser and inserts it into places where it would be fine if it was, like, not there. You know?
I read something today that said people who are constantly inserting the words and phrases "like," "you know," and "I mean," are not ditzy and immature if that crossed your mind. In fact, they may be more thoughtful than everybody else.
I had a friend once who would constantly say as the conversation was dying down, "I don't know, you know?" Actually, she had the amazing overall ability to plop in a record number of "you knows" in any sentence. I swear she could pack ten of those things into an eight word sentence. It drive me insane! But perhaps she was onto something.