This article talks about a scientist who wanted to test the idea of "double dipping" - that is, whether or not a significant number of germs are transferred when people dip, eat and dip again. It turns out fewer germs are transferred than expected - and thicker dips are better than runny ones because more of the dip sticks to the chip and doesn't run your germs back into the bowl :)
http://www.nytimes.com/2008/01/30/dining/30curious.html?ex=1359435600&en=4685daa806b50ab5&ei=5124&partner=permalink&exprod=permalink
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