@ash78
I've had small shark brush up against me.
We regularly see dolphins in Destin, and they often get quite close to shore as they hunt. One time we were out in the water, chest deep, saw a shadow in the water, and we were like, "oh, a dolphin" and started going closer. We got maybe 15-20' away at a couple points, and then realized this thing was not coming up for air, and its tail was moving side to side.
Most of our group kind of freaked out at that moment, but I wasn't worried, just more excited/interested. It was as large as a small dolphin, and could've surely done some damage if it wanted to, but clearly wasn't after something that looked like us.