Extend the Story - Add a Room

Your mother has been hassling you to take your sister with you on a vacation before you go back to college. You're not too happy about this but figure it's got to be better than going alone. You tell your sister she can come along as long as she doesn't do anything to annoy you. Her eyes light up with excitement. You start to feel really good about yourself, doing your sister such a favour. Who knows? You might actually have a good time with her. Your mother sees the two of you off at the bus station. As she drives away, you realise you are late for the bus. Your sister starts to stress out. To calm her down you:

Buy her an icecream and say you'll go call your mother's cell phone.