Yes I have. And I've been wrong quite often. I misinterpret some looks and other people misinterpret some of my looks. But somtimes it IS real. To be honest that 60 year old was probably creepy, but probably not a killer or a rapist.
Take the bus for example, I'm sitting by the isle, and there's a chick sitting in front of my by the window, I'm staring into blank space out the window, too tired to care about anything and she starts to feel liks she's being stared at (I noticed when she turned her head around quickly then turned back and shifted nervously). I had no bad intentions for this girl woman, I don't even really register what she looked like, I didn't care I was staring out the window, a lot more interesting when I'm tired.
Take another example, the crowded subway, I'm trying to read the metro map and this chick is sitting right next to it. She thinks I'm staring at her which makes her uncomfortable since it's prolonged. If she's a bit paranoid, lots of people are, she probably thinks I want to kill her. I'm looking intently in her direction without smiling. After all I'm trying to read the fricken map to know which stop I'm getting off at and I don't feel like smiling in the crowded subway when I'm still 90% asleep.
Take another example, this time illustrating the gut feeling can be right. I get on the subway at 6am on Sunday with my case after a 15 hour trip to get home. I sit down and I kinda feel someone looking at me, and I hear laughing. Somehow I feel like it's about me, (I was wearing a funny hat), I don't give it too much thought. But then I got this really negative aggressive vibe out of nowhere. This dude sits in front of me, and 4 of his friends join him., He stares right into my eyes non stop for a good minute. and I hear his friends discussing and staring at me kinda like they're assessing me. I felt there was a high chance I'd be attacked when I got out. So now I listen up. Turns out I'm right, these guys are discussing robbing me in arabic, but came to the conclusion that it wasn't worth it cause of my crappy travel clothes, they were like "nah he's got no money". My gut instinct was right, nothing happend thanks to my clothes though :D:D
So yeah, a lot of the time it's misinterpretation. But sometimes it's comletely real. In our brains there's what scientist have found to be mirror neurons, which can recognise emotion in others and make you feel the same way. That's how empathy works. But it doesn't just work for feeling bad for others. If someone really wants to kill you, you might get a really really angry, aggressive or just bad vibe from them.
But again it might be something totally unrelated. Maybe the guy is just pissed off at his boss, and you've got nothing to do with it. Chances are it's nothing.
But personally I wouldn't stay to find out if those emotions are directed at me or not. So know that often your gut is wrong, but stay on the safe side and trust it anyway when you get bad vibes.