A simple survey that students complete at some point during the first week of school. Normally I hand it out during the second day of school. The survey concludes with having the students write a short letter to their future selves. The cool thing is that I tell the kids I will give it back at the end of the year, and then I never mention it again so they'll forget about it. On one of the last two days of school I hand it back, and students usually are pretty entertained by how much they've changed already during one short school year.
*Make sure to edit out the two "Mr. Bruce" references and change them to your name if you are not planning on making any other adjustments.*