When you are struggling with remembering a word or are trying to figure out how to finish a thought, just make noises instead. People love sound effects. Especially when they are off the cuff, loud, and annoying. So the next time you are struggling with a thought just start making an alarm clock noise with your mouth. The person you are talking to might be confused but at least you don't look dumb because you couldn't remember what you were going to say!