Pyloric sphincter controls the movement of food from stomach to
duodenum. With parasympathetic or vagal stimulation it opens up or
relaxes and with sympathetic stimulation it contracts or
closes.
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This is a quote that Wayne says on Wayne's World which is a form
of an insult or joke. The idea is that you make the statement
"Sphincter says what?" and try to prompt them into saying "what"
ultimately calling them a sphincter.