In this article, the author relates how a hands-on chemistry investigation provided her the inspiration to develop an effective safety lesson for her third grade chemistry class. She began the lesson by demonstrating the use of pH indicator paper to show that ordinary household (white) vinegar was an acid. With the students, she wondered aloud whether diluting the vinegar would make it less acidic. From this acid-base exploration, the author learned that when working with vinegar in a science investigation in class, goggles and gloves are needed. She also arranged for a representative of the fire department to visit their class to talk about chemical wastes and had the children make "Chemical Safety" posters to illustrate the safe handling of chemicals. This experience taught the author that it is never too early to introduce young children to chemistry lab safety concepts like never tasting or touching unknown substances, no matter how harmless they may seem to be. (Contains 1 figure and 5 resources.)