In this hypothetical situation, your next door neighbors are a nice couple with 3 special needs kids, ages 5 to 10. One day the parents knock on your door, excited. "We've talked this over with our lawyer, and we'd like to make you official guardian to our kids, should something happen to us. Susie's (the wife) adopted and has no family, and my family already has more than enough mouths to feed and we don't have any real friends to count on. So we'd like to appoint you because, well, you're our only option. What do you say?"
"Oh, and can we impose a huge favor on you? Can you watch the kids for 4 hours tomorrow? We'll pay you $50 for the inconvenience. Tomorrow, we're both going skydiving! It'll be our first time without an instructor. We're so excited! What do you say?"