Don't Double Dip That Chip
A study by some Clemson University undergrads has shown that putting a food item in your mouth and then putting that item into a bowl of dip, causes that dip to have more bacteria than normal. Transfering 50-100 bacteria between mouths with every dip to be precise. Amazing. The results of their, "running downstairs with scissors in your mouth" study have been inconclusive.
Come on, 3 seconds? Who sticks a chip into some dip and holds it there for that long before taking it back out? I'm willing to bet a lot fewer bacteria transfer over in the quick in-and-out dip most people would do.