If you've ever tried arguing with a toddler, you know there's simply no winning. They have a logic all of their own and simply cannot be deterred once they've made their mind up about something. They're fairly brilliant in their tactics too, as ruthless as they may be.
Take 3-year-old Adela in this video for example. She's at the toy store with her dad, on a mission to buy a birthday gift for a friend. Adela, however, has another idea -- more My Little Pony stuff for her. When her initial requests don't work, she gets serious and resorts to extortion. "If I don't get any ponies or any horse, I won't be able to wuv you anymore," she tells him. "I'll only be able to wuv my mom."
You have to watch to get the full impact of her persuasive powers.