Gear Warning

I had an old dragon of a schoolteacher who used to bark at us
eight-year old kids and, if we misbehaved, would rap us over the
knuckles with a wooden ruler (this was in the old days!).

Her voice would probably do the trick! Failing which, how about a
mechanism to rap you over the knuckles while the schoolmaam berates
your stupidity?

Wives tend not to use voice commands so much as "the look".

Mike