I was playing with a woman once that I ultimatley couldn't trust. We'd tie each other & tickle and it was great fun despite the difficulty in taking the tickling. But she started struggling with depression, then started doing drugs. This combination led her to either get very angry, or very confused. Finally, she started playing in heavy S&M with another partner who was, I think, a little dangerous (he brought a gun into a scene involving her once). The last time I was with her it was my 1st time fully spread eagled, so I was already uncomfortable with the situation. I had the lights out and candles going. She took one of the candles and tossed the wax on me - shocking, painful and uncomfortable, but not terrible. Been there, done that. EXCEPT that I was in a new & uncomfortable position, so I was already tasting real fear, then she goes & does something unpredictable like that. Not too awful if it's your lover playing with your mind and senses and all, even if it scares you a little. But there was a trust issue here - if it's someone who is going through some problems of stability... well, it frightened me. I had to realy nicely and convincingly, but firmly, talk my way out of the bondage (foolishly we weren't using safewords because up till then we pretty much trusted each other and could read one another very well). We still tickled, but that was the last time. So, nothing really bad happened, but I just got terribly scared becasue my play partner was becoming unpredicatble and having emotional problems - if we used safe words, could I trust her to honor the word when, say, I started having chest pains? I stopped BEFORE something bad happened.