A year ago. I was in a large lake park with picnic tables and benches. I was sitting at a picnic table when I heard a strange sound, like a bird. I thought it was a bird in a tree. But then it made a different sound, like a dog or puppy yelping. It was like a single yelp from a dog.

It would randomly make the noise about every one minute or so. Either a bird noise, or a dog noise, randomly alternating between the two. My instincts told me it was a human. My first thought was someone is trying to fuck with me.

Turns out it, there was an older woman (50s or 60s), and a younger guy (20s or 30s), sitting on a bench, facing where I was sitting, about 100 feet away from me. I had seem them walking towards the bench a few minutes earlier.

It took a few minutes of observing and then I saw it. The young guy made the noise. I was watching them from the corner of my eyes, so it didn't look like I was staring. Randomly every minute or so he would make the noise. It looked like it was something he couldn't control. It looked and sounded really crazy. Eventually they got up and walked away, and I heard the bird and puppy noises continue as they walked away in the distance.

So fucking bizarre. I searched online, and think he might have some kind of Tourette's syndrome. Probably with his mother who is stuck caring for him his whole life.