I like to think that most people with whom I've actually met and consider a "friend" would take care of something for me, and it would be in the same condition as when I left it. Candy is different, you friend will eat it for you so you don't have to worry about it going bad
Besides, you could just pull a jumper and make it "unusable" to most non geeks. They would try to fire it up, and it wouldn't work, so then they'd be scared and act like they never touched it
Cool