This put me into a fit of giggles at the stationery store:
Battery operated! How many mistakes are you making that you need batteries? Who is buying this? I can imagine if this existed when I was a kid:
Me: But Muuuuuuum! All the other kids in class have them.
Mum: Well you can just use your rubbers the old-fashioned way!
Brother Atlasta: [smirk] Yeah, Hal. Use your rubbers the old-fashioned way.
Dad: Anne! They're called "erasers" in this country!
Mum: Well, I don't know! [to me] Don't say "shut-up" to your brother!
Me: *sigh* [rolling eyes]