This is stupid.

I've seen grown men made to do this, but at least then, nobody thought it was gonna change them. This is punishment by embarrasment, and no - I don't think its an effective parenting tool, at all.

I'd have told my parents exactly what they could do with that sign.

This isnt mental abuse... or, at least no more than "you can't watch TV" is. But I don't think its anymore useful than grounding/taking away privleges/etc.

Who knows. I don't have kids. But this wouldn't have worked with me.