Been there done that.
P.S. My daughter told the cashier I was wearing lacy underwear when she was 3.
This lady has her son in the stall with her. He asked loudly. "Mom. Are you going poop?" She tried to shush him but he became even more insistent. Then came the unmistakable sound and smell and the boy became so excited cheering her on as she frantically shushed him.