Ever have one of those classes where the lesson you thought would fill the time was over early and there was too much time to fill at the end of class? Or the lesson you wanted to do has to be postponed because class was disrupted by a fire drill, class meeting, class pictures, or other unexpected event? Suddenly you are facing an entire class with nothing to fill the time. We all have those times and here is a solution. I used to keep a small 3x5 or 4x6 file box on my desk with file cards in it. Each card described a short activity or lesson that could be taught at any time with limited materials needed. Eventually I had enough cards that I could organize and classify them by type or topic. When I used one I noted on the back of the card the date and class I had used that activity with. Anytime I found an idea on a website or in a magazine or thought up an idea, I wrote it down on a new file card and put it in the box. Never again did I have more time than lesson or find myself without something interesting to keep students involved. This was also a valuable resource for my substitute teachers who might need additional activities beyond my lesson plan. Most activities would take anywhere from 5-15 minutes to complete.