What's in your hip pocket?

Today I showed up at school and found out that my cooperating teacher was staying home sick and a substitute was taking her place.  Since I was more familiar with the material, I taught the classes today and the substitute helped with grading quizzes, etc.  My cooperating teacher had written the outline for today's classes on the board yesterday, and we had gone over the plans together yesterday, so I felt prepared for the classes.  Except for one detail: our 4th period class was supposed to start with a puzzle, and I didn't know what that puzzle was.  I searched her notebook where she keeps papers, looked through the folders on her table where she organizes the papers for the day, and still no puzzle appeared.  After searching for many minutes, I emailed her and asked where I could find the puzzle, and she responded by saying she didn't have anything specific, but planned to come up with something.  Oh, I can do that!  We did 2 quick puzzles out of Michael Serra's Mathercise, one on directions (N,S,E,W) and one on reading a sentence correctly.  I thought they would be too easy, but several students struggled with the ideas.  I think we need to do more of them!