I think that if done tactfully it would be effective. However, I admit I don't have kids and I don't have dealings with kids that young so you probably know better than I. I was reflecting on my days in basic training.
Trick play, Coach called a QB Keeper Right. I was at QB, didn't know my lefts and rights to well, ball was hiked(shotgun). Entire offensive line goes right, entire defense goes right, confused QB goes left.....touchdown