Answer:
the tip-of-the-tongue phenomenon.
Explanation:
Tip of the tongue condition is a personal sensation that people have the conviction that they know the target word they're looking for, but they can't remember the word. They are often capable of remembering words with similar sounds and context, but never the exact word they're looking for. It happen when one knows that they know the details, but it seems to be momentarily trapped behind some sort of mental brick wall. As per the question, Mickey is experiencing the tip-of-the-tongue phenomenon.