This is a bit of an old story, but just another reminder as to why you shouldn't underestimate your youth students.
About six months ago, one of my 11 year students proudly told me in between drills that his parents bought him a cellphone. A little thrown off by the non-sequitur, and a little surprised still that kids have phones, I say to him "Man, you're 11. You don't need a phone. Who are you going to call?"
Not missing a beat, the student replied with a dead-pan "Ghostbusters."