I hate it when you are talking to someone and you struggle to find a word you very well goddamn know, then you spend the rest of the day thinking what that word is. Then you can't sleep, cause you are still thinking of that word.
You give in and open your thesaurus/dictionary to look for the word. "It sounds like this, I KNOW IT... I just cant place a word.." Then you finally get to sleep. When you wake up and as you are eating breakfast, you finally remember what the word is, and you call your friend and try to resume your conversation at the point where you struggled, and your friend forgets what you were talking about. Now you have that goddamn word repeating over and over in your head.