I gave the students in 3rd period a 1-page handout for the lab they were about to do. I told them they would write their data on the back and do their analysis on the front and then that's what they would hand in.
Student: Miss Carr, what do you want us to do with the back of the paper?
Me: Record your data from the experiment.
Student: No, I mean do you want us to hand it in?
Me (looking dumbfounded): hand me the front of your paper.
(Student gives me the paper)
Me: Now where is the back of the paper?
Student (after a while): Oh.
