Yesterday, and for much of the past year, I regularly did something that was perfectly legal.
Starting today, if I do the same thing, I am breaking a New York State law.
What is it that I’m doing?
The first correct answer earns a signed copy of SuperFreakonomics or a piece of Freakonomics schwag.
Addendum: The answer and winner are announced here.

ok it’s a guess. texting while driving?
Are you referring to the Booster Seat Law (to include children under 8, previously 6)?
texting while driving?
Perhaps you are letting your 7 year old child ride in the car without an “appropriate child safety restraint system”
New Seat Belt Law Changes
Is required for all children until their 8th birthday as of November 24, 2009,. (Prior to November 24, 2009, the requirement applies to children until their 7th birthday), and….
Have your under eight-years-old kids not in a car seat?
Does it have to do with the new child safety restraint laws in New York?
Took a charitable deduction for a gift to the U.H.O.