I think it was the Seinfeld episode where someone pointed out to George that he was double dipping, that brought the whole idea of double dipping to the world. So we have Seinfeld to thank. Last year the food microbiologist's undergraduate students examined the effects of double dipping using volunteers, wheat crackers and several sample dips. They found that three to six double dips transferred about 10,000 bacteria from an eater's mouth to the remaining dip sample.
The professor said the students' research didn't get into the risk behind such a bacteria transfer, but they got the idea.
"I like to say it's like kissing everybody at the party — if you're double dipping, you're putting some of your bacteria in that dip," Dawson said.
Source: AP
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