How do you react when strangers touch your baby?

I'm not talking about friends or family that you invite to hold or touch your baby. I'm talking about those strangers in the food store, people at church you don't really know, person at the library, whatever. I know it sounds overdramtic but people will try and touch my newborn all the time and it makes me crazy! Especially because it's cold and flu season. One time a lady touched and kissed my baby's forehead and I had hardly ever talked to her before! I am always in such shock that I don't say anything.
I want to know how you guys react when people do this to you and your baby. 

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