Almost similar.
Not really an involuntary paralysis, but this brings to mind something I participated in several years back, similar in the same sense. When I was about 15 or so, there was a real, real pretty girl I had a crush on (she was probably about 14 at the time, a real cutie, she was short, long dark brown hair, prettiest brown eyes....) ...*Oh, anyway, she was on a swing in the neighborhood where we lived. I was standing there talking with her. While we were talking, she slowly slinked down on the swing to where her butt is supposed to be, well now the backs of her knees were there, her butt about a foot off the ground, and her arms were stretched tight as she was hanging on, kinda lightly swinging around while we were yapping. Well, of course after about 30 seconds of looking at this, I came up behind her and started lightly tickling her ribs. She just laughtd a little, then was silent, laughing expression on her face. "How neat" I thought. I kept on, and I could see her shaking, but not moving or making hardly any noise. I really started to give it to her good, wanting to her her laugh like hell (Nope, just the ol' "silent laughter"). I'm sure she couldn't get the strength to pull herself up, and if she let go, she would bust her ass. I finally messed up when I stopped tickling her sides and under-arms, and tried to get her knees, which under all that stress, were tight as hell, and I couldn't get a good grip on them, and she finally pulled herself up.
..She kinda wiped her pretty head and was giggling a little. I sarcastically asked her "what's wrong?" and, smiling, she goes "NOTHING, except you TICKLING me!". How cute she was.
