Trying to remember a word while it plays hide and seek in your brain

Sometimes the word you want to say is right on the tip of your toungue then poof it disappears. You might have even said it two or three times already but suddenly you can't think of the word. You concentrate real hard trying to think of what it was. It is frustrating when you know you know it. It is as if the word has decided to play hide and seek with you. It is in there but it is hiding within your mind. After searching for a moment you give up and go on with your conversation. Then later that day out of the clear blue the word pops up front and center in your mind. As if to say hey here I am did you forget you were looking for me. Of course you had forgotten. But when you see it you feel excited that you finally know the word. You know that you probably only got a fifty fifty chance whether you will remember that word the next time it comes up in a conversation.