One of the best ways to influence people is to ask someone to do a favor for you...

		wallflower on Nov 9, 2011 \| parent \| context \| favorite \| on: Lesser Known Ways to Persuade People One of the best ways to influence people is to ask someone to do a favor for you. Especially if the person you are asking has more perceived power. It is called the "Ben Franklin Effect" Teenage girl (to teenage guy): "Can you help me with my homework?" http://en.wikipedia.org/wiki/Ben_Franklin_effect

I think in your example case, the teenage guy would be helping for different reasons.