Yes, I've done it a few times.
One, I wasn't sure of her intentions, she was younger than me by about 15 years. She did interest me though. It eventually led to her staying over and her hitting on me, she asked me to touch her to show how hot she was. At the time she was crashing at mine.
I didnt talk about it to anyone and she stopped talking to me afterwards. She made any attempts to speak to her feel like I was hassling her so I just gave up on being friends. That was the end of it. About 6 months to a year later, a friend who had slept wither her asked why I hadn't. Turns out she'd told him about that night. I never asked him to say what she'd told him, because to me she denied it was a big deal staying over. When he asked why I didn't sleep with her, I just told him the truth. I didnt sleep with her because it didn't seem right at the time. Plus, I wasn't sure what she wanted. At the time, I never entertained the idea of anything that wasn't a relationship. Anyway, afterwards she treated me badly, so it was probably a good decision. To this day though I wonder why not making a move on someone should result in that. But hey, it's a stupid thing to wonder. I guess this may steer short of the friendzone.
My friends sister, she was attractive (but not to me), a very nice person. She told me she loved me, I laughed and blocked her attempts to grab me for a hug and inevitable kiss. I was laughing and said I didn't believe her. This might seem cruel, but she was laughing a little true and saying she was serious. I believed she thought she was serious, but I didn't believe the love thing. A few reasons; We'd not really spent much time together, especially talking. She'd been drinking. She had a boyfriend. I just felt it was a crush. We remained friends but she didn't really stay in touch much. I found out she eventually hooked back up with her baby sons father after a couple of years, they now have another child but un/fortunately aren't together anymore. Her sister (my friend) was hoping she'd split up because he is quite domineering and not good for her. Her sister isn't one to exaggerate. I do feel for her, wish she'd met someone more like herself. Unfortunately I couldn't be that person.