Everyone has to start at the bottom of the ladder. For Yahoo CEO Marissa Mayer, that rung was the County Market in Wausau, WI, where she worked as a grocery checkout clerk the summer she turned 16. She told Fortune, I learned a lot about family economics, how people make trade-offs, and how people make decisions on something fundamental, like how to eat. And, quirkily, I picked up the habit of turning all the bills in my wallet to face and be oriented the same way, because we needed to do this as we counted out our tills at the end of our shifts. It still bothers me to this day if a bill in my wallet is turned the wrong way. At MONEY, we’re looking for the funniest, grossest, and most heartwarming stories about first work experiences. Tell us yours. What was your first job? What did you learn? What advice do you have for kids today? Tweet us at @Money with #firstjob, or write us using the form below, and we might publish your response. (Answers may be lightly edited for length and clarity.) Name(required) Age(required) Email(required) What was your first job?(required) What was the best part? What was the worst part?