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"Many engrams, for example, could be traced back to clams. The clam's big problem was that there was a conflict between the hinge that wanted to open and the hinge that wanted to close. It was easy to restimulate the engram caused by the defeat of the weaker hinge, Hubbard pronounced, by asking a pre-clear to imagine a clam on a beach opening and closing its shell very rapidly and at the same time making an opening and closing motion with thumb and forefinger. This gesture, he said, would upset large numbers of people."
http://www.xenu.net/clam_faq.html