Stroke victims tend to have certain patterns of movement. For instance, patients often walk with a raised hip on the bad side, to let a messed-up leg go through. Normals keep their hips even. Once you have noticed the stroke walk, you can spot us easily. Then you will realize that we are everywhere. 6 million people in the US are living with a stroke. Stroke is a top cause of long-term disability in the US.
You can strokewatch. If you use binoculars, you are weirder than we are.