From the Times:
The study, to be published later this year in the Journal of Food Safety, is the only one I’ve ever seen to proclaim that it was inspired by an episode of “Seinfeld.” It was conducted as part of a Clemson University program designed to get undergraduate students involved in scientific research. Prof. Paul L. Dawson, a food microbiologist, proposed it after he saw a rerun of a 1993 “Seinfeld” show in which George Costanza is confronted at a funeral reception by Timmy, his girlfriend’s brother, after dipping the same chip twice.The study's result:
“Did, did you just double dip that chip?” Timmy asks incredulously, later objecting, “That’s like putting your whole mouth right in the dip!” Finally George retorts, “You dip the way you want to dip, I’ll dip the way I want to dip,” and aims another used chip at the bowl. Timmy tries to take it away, and the scene ends as they wrestle for it.
Professor Dawson said that Timmy was essentially correct. “The way I would put it is, before you have some dip at a party, look around and ask yourself, would I be willing to kiss everyone here? Because you don’t know who might be double dipping, and those who do are sharing their saliva with you.”This finding, which I would say is common sense if you understand anything about germs, could save your life.
Maybe not, but it's possible.