@Another Movie Addict: that definitely sounds like a rough situation. I'm surprised you got so much grief from the people waiting in line though - couldn't they tell you were working and doing something new, without backup on another register? It could be too that they were more mad at him than they were at you. Kudos for making him happy, though - it sounds like he'll be back, with compliments to your boss! :3
@Totalanimefan: I'm sure you'll do fine on the exam, but good luck anyway!