Growing up, I actually thought it was one of the original ten (but I also thought Juneau was on an island until I was twelve, so I wasn't always tuned in to reality).
NO READING AT THE TABLE
Followed closely, of course, by
FOUR ON THE FLOOR
and
DON'T STICK YOUR TONGUE TO THE MONKEY BARS WHEN IT'S COLD OUT!
My kids are growing up thinking the most important commandments are
NO WHISTLING IN THE HOUSE,
THE DRIVER CONTROLS THE RADIO,
and
USE A TISSUE!
I wonder what other tapes will play in their heads when they're older. What was the eleventh commandment at your house?