Me: *comment about something*
Me: No, no, no. You need to work on your technique. You can't be a proper teenager without a really good eye roll. Do it again, only more exaggerated.
G: *big dramatic eyeroll*
Me: Okay, now to really add some impact to it, you'll want to put one hand on your hip, like this.
G: *hand on hip, rolling eyes*
Me: See? I was your age once. And now add in some sound effects, like this: "Gah, Mother. Ugh." And maybe a tongue click and an exasperated sigh.
G: *repeats, giggling*
Me: There, that's much better. Now ... don't ever do it at me. Got it?