Independence Day Slacking

Familiar from past history, Sarah, wants to present a gift to my parents and they decided to organize a trip to the mountains. A dad to visit a success, took with him a barbecue. He wants to cook for your family tasty meat and sausages, that's just helping him no one wants, and indeed Sarah, as always take time off from work. Fool around with it so that the father did not notice her little pranks.