Backseat driver

My darling little boy, Lucas, is already too much of a backseat driver for my own liking. Yesterday, he was ever so politely asking for mommy to hand him a book (which happened to be in the floor in front of his car seat)....happy to oblige, I handed him the book, but as I was doing so, I ever so slightly crossed the yellow line (no worries, we were on a pretty quiet road & there was no traffic in sight). He did nothing but look at me and say, "Mommy, you not driving good"