You have time, but not enough to start a lesson, create a 5 Minute Filler Box up with various brain stimulating activities. Use index cards and store in box various 5 minute activities. Activities can be analogies, brain teasers, 20 questions, 5 clues, anagrams, and picture puzzles. If you do not write them on the board, have a file where you can keep the worksheet papers. This can be student lead to free you up for your next class.