I affix this label to a large (think gallon sized or larger!) container. During the first week of school, I explain to the students that anytime we do something they think is fun and memorable, they can jot it down on post its (which I keep next to the container) and place inside. Then at the end of the year, we read over our memories from the year. It really is a fun reflection piece to help plan for the next year because you can tell what was a huge hit.