When I was 5 years old, I was at a nice river beach with my mom my sister and my brother.
Well, after a while, I had to poo so I told my mom I needed to go potty. Not understanding that I had to poop, she told my sister to take me out in the water so I could just go in my swimsuit. I was wearing one of those cute little one piece suits for little girls. I told her that I didn't want to go in my pants, but she said, that everyone dod it at the beach, and it would just wash away in the water.
So, off I went with my big sister. We waded out until my bottom was covered by the water and I squatted and proceeded to go (poop) in my swimsuit. My sister hadn't been paying attention, and only realized what I'd done until I told her that the poop didn't wash away like mommie said it would. I had to be taken to the ladies room to be changed and have my swimsuit washed out.
Mom never told me to go in my pants again without specifying pee.