It's necessary to hide. Aliens are searching. There's a large thicket of thornbushes and scrub on the streetcorner where your house is: you can crawl inside there where you can see without being seen. But here's a problem: your best friend arrives on his bicycle searching for you. How to signal to him that he should leave, without giving yourself away? And now you realize you don't have your glasses: vision is unclear, unhelpful. The house is an older Victorian well back from the street with open lawn to cross. Should you run back inside?