Clown is right.

If you watch the kids, 1/2 of them put the mask over their mouth, but noses are sticking out above the mask. Some of the kids are wearing it like a chin diaper. Look in the background and you'll see people walking by with the mask over their mouths, but noses exposed.
Even the lady sitting there watching the kids... has no mask on.

Basically... everything the clown is telling them goes in one ear and out the other. Watch when the clown leaves... and see how fast the kids go sell those masks for money. :>)