Little kids are terrible liars, which is made even better by the fact that little kids are too naive and inexperienced to realize that they are awful at covering up the truth.
There is no shortage of videos featuring small children lying about the whereabouts of donuts (chocolate and glazed), but their fellow preschoolers seem to have trouble learning their lesson. This is probably due to the fact that 4-year-olds don't know how to navigate the Internet (yet).
If they did, the girl in this video probably wouldnt have lied about getting into her mothers lipstick. How do I know she's lying? Because I watched the video and saw her face.
There are just certain things you life you can't really get away with.