I teach Surgical Technolgy and I find it's easy to lose the attention of my students if I meander away from the topic even if it's only for a few minutes. I, the instructor, have to be as sharp as a tack to stay on task even though what I'm trying convey sometimes relies upon sharing my experiences to paint the picture to match my daily lecture material. "Sharing" can easily turn into an all out Q&A session if I don't hang on to my reins tightly. When my students get so excited and inquisitive is when losing focus takes place. It can difficult to draw the line between "sharing" and actual book lecture; both are so valuable.