In the 70s & 80s, this used to be a thing in New York. Local news station Channel 5 broadcast this message every night,

“It’s 10 PM, do you know where your children are…?

Great thing to ask parents, but it takes on a slightly more sinister tinge when delivered by Grace Jones & Andy Warhol. You get the feeling like they might want to add

"...tell us and we'll get them and take them to Studio!"

Watch.