Well, other than the fact that every damn teacher known to mankind does this without explaining what the hell they're doing, you can't really expect a 7-year-old to not try it.
Even if he does it with the wrong hand...
I just didn't do it. Looked stupid to me, and I never had problems with passing out paper because I made myself invisible.
Still, we can't all be the brightest bulb on the Hanuka tree.