Killer Gnat?

Last night I took the teen to Walmart to get something and she (accidentally of course) ran into her boyfriend who WORKS there and as we were leaving she was telling him bye and from the back seat I hear the preschooler squealing like a stuck pig. I figured she saw a spider or a gnat or some other KILLER animal. I asked what was wrong and almost in tears she said "EEWWWWW! SISTER KISSED A BBBOOOOYYYYY!"