Dream of

Me and my son were at the beach. He was playing at the shallow end with a dead whale. I told him to get out of the water and a car appeared. As he was getting out of the water something grabbed his leg and pulled him over towards the car. I ran over to try to get him and as I was the thing pulled him so hard he went under the car and into the water. I tried to get him but couldn't reach him. Last thing I saw of my son was him under the water and then he disappeared.