BACK THAT UP

My Blazer won't move into reverse! It worked perfectly last night at rehearsal and again at the IHOP afterward. But now it won't back up! Can you believe that? Terry reminded me that I should be thankful that I made it home safely. Now the question is, will I have time to get the thing repaired before I need to drive to tonight's performance? What's the weirdest thing your vehicle's ever done?