Huck said:"Okay, here's the book, go out and do your preflight, be sure and drain the tanks, I'll stay in here and check the weather. Oh, and why don't you let me keep the keys....."
I'm pre-solo. I always pre-flight alone, and the keys are always hanging on the DG. If I really wanted too, I could start up, taxi out, take off, and be gone. I don't because I fear the jail time, and I think my instructor might get a little mad.