You shouldn't eat your boogers because it's gross.
Bobby is sitting on the couch by Sue with a booger stuck to his finger.
Bobby wants to get rid of the booger.
Bobby goes to the restroom and wipes the booger off with a tissue.
Bobby decides the easiest thing to do would be to just lick his finger clean.
Sue never knew the booger existed and still has a good opinion of Bobby.
Sue notices the booger going into Bobby's mouth and starts feeling nauseous.