Not me, but my brother. He was about 13 at the time if i remember correctly. My family loved to go camping. It was one of those times that we were at our favorite camping site right next to the lake. Perfect view and perfect weather. It being such perfect weather the grown-ups decided to take us kids for a quick swim. So we were all laughing and splashing having fun when my brother steps on something. Now the water wasn't clear by any means, but he said it felt like some kids foot. My brother than eagerly waits for the person to pop up from under water to apologize for stepping on them. My brother then waits for what he said felt like a minute or so. Being the kid he was, he just thought they could hold their breath for a really long time and went about his day and kept playing. Before we knew it, it was time to leave and head back to camp. Fast forward to that evening when we all enjoying our hot dogs around the fire when a park ranger comes up to our camp and ask to have a word with my father. Turned out that two boys had went swimming earlier that day without supervision of anyone, and drowned and the park ranger was trying to find their parents.
TL;DR My brother stepped on the foot of a dead boy who had drown earlier that day in the lake.