When I was 7 we had a teacher called Miss Woodcock who would wield complete control over the rowdy boys in the class by threatening to KISS them if they didn't behave.
So terrifying was the prospect of Miss Woodcock's lips making contact with us that instead of having to shout at us to sit down and shut up, she would simply go to her handbag, get her lipstick out and slowly start applying it.
I should point out that she never actually made good on her threat. I suspect, also, that she never tried this on secondary school boys.