A hot Monday night with no a/c. The three of us (male, about 20) decide to go lie on the golf course greens a few blocks away at the top of the hill. On the way we pass a dude in tennis shorts and shoes, tshirt in hand. He says nothing as we pass. A bit weird but it's a hot night and there are three of us. We get to the green we liked, lie down and chat for a bit. Something makes me get up and I see the same dude right at the top of the hill, maybe 250' away. He's now entirely naked except for tennis shoes. I mention this to my buddies and without a word they get up and start to walk away. We're all a bit nervous when one of us says something like "ha ha, wouldn't it be funny if two of us ran off and left one of us here alone with that guy!" This is the cue for the other guy in our trip to run for It, but he's left the two of us. No dice. We laugh to each other and check on the guy on the hill. Who is now, completely silently, running nakedly at top speed towards us. With something in his hand. No, not that, it looked like a knife but we didn't hang around to make sure. He chases us all the way home, at one point running through waist tall grass without flinching. Fortunately we knew the area and were able to lose him without him finding our house. We get home and watch the dude walking back and forth for what felt like an hour but was probably 10 mins, weapon in hand, entirely naked, looking for us. Once he cleared off we hit the clubs even though it was a Monday. Always felt a bit on edge for the rest of the time I lived there.