I have a friend while not completely blind really needs his seeing eye dog. One night we are at a friends house in a large dungeon. It was his first visit and hadn't gotten the lay of the land yet. He gets up to get a drink for a submissive who had just finished a scene and sees a dark area in the middle of a white wall. Thinking it is the door he walks up and goes to open it only to grab the side of a girl chained up in front of the wall. As she is blind folded she doesn't know whats up and lets out a scream. In seconds she is in hysterical laughter. It seems he has grabbed her side. Thinking there is someone in the door he starts to feel around and finds her ticklish spot. Needles to say it was soon contagious and poor girl got the tackling of her life before it was all over.
Another time we were at another dungeon when he tripped over something on the floor. With his hands cuffed behind his back he did a couple of spins only to land on top of a girl tied to a bench. The Dom who was in the middle of a heavy flogging didn't miss a beat and delivered several heavy blows before we could pry him off. he is 6'4" and she is 98# soaking wet. It was all we could do to keep from laughing and breaking the scene. After we all had a good laugh and she thought it was part of the scene.