This is a true story: My wife went to her first College Algebra class with a brand spanking new graphing calculator - still in the box. About 45 minutes into the class it was time to start using the calculator. She proudly took it out of the box and began to perform the exercises. However there was one problem - no matter what key she pressed, the display would not clear. After pressing nearly every key on the calculator, she gave the calculator to another student who seemed to be doing really well and asked, "Could you show me the key to clear the display?". Without smiling or saying a word the student peeled off the clear plastic example display and handed the calculator back.
(From the "Rest" of RHF)