I remember something similar in high school. You'd have someone constrict your coratids (jondra?) with their hands for a few seconds. Like the Vulcan neck thingie. Once you'd start to slump they'd let go. It was usually done as a party trick sort of deal. You'd get a little head rush, then pop right out. In retrospect, pretty stupid.
I've never understood the David Carradine thing. I can't even fap with my right hand, let alone try to coordinate a rope around the neck thing. Just plain whacking off is good enough for this ol' cowboy.
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Having killed someone doesn't make you a killer- @KINGROCHE