I'm riding on a bike path yesterday afternoon, temps in the 60's. It was a perfect day. About 20 miles into my ride I come up on some guy probably in his 30's at an intersection on an older bike with a couple saddle bags, kind of beat up. Now, I was wearing shorts and a long sleeve jersey and I was comfortable. This guy had on jeans, a heavy winter coat, winter hat with a bid crooked mushroom looking helmet, and he's talking to himself. He turns and starts talking to me and I can't understand what he's saying, so I nod and say "yea" and I go through the intersection. I'm just cruising at about 17 - 18mph and I hear a bike come up on my left. It's heavy winter coat guy, huffing and puffing. He pulls right next to me, practically touching me, and he just stares at me with this weird look on his face. I glance over at him, and I give him sort off a dirty look, to let him know I'm annoyed. Now I don't mind being passed, I don't mind a friendly cyclist who wants to chat for a few minutes... But this guy was just a weirdo and he won't stop staring, finally he says "you can't beat me", I say "I'm not racing pal, I'm just out for a ride". Well he stays right next to me staring, so I finally accelerate to about 20mph. He gets out of his saddle and sprints up right next to me again, once again staring, and I mean his head is turn completely to the side staring at me. I finally say "Hey buddy F**k off!". He says "It's a public path I can ride wherever I want". Now I'm about to sit up, swing my fist out and clock this guy, but I figure I'll really speed it up and try to loose him, Which I did. He finally fell back. but if somehow he was able to keep up, he was going to get a punch right in the face.