Grown-ups say things like:

Speak up

Don’t talk with your mouth full

Don’t stare

Don’t point

Don’t pick your nose

Sit up

Say please

Less noise

Shut the door behind you

Don’t drag your feet

Haven’t you got a hankie ?

Take your hands out of your pockets

Pull your socks up

Stand up straight

Say thank you

Don’t interrupt

No one thinks you’re funny

Take your elbows off the table

Can’t you make your own mind up about anything ?