Laws were seemingly made to be broken, and since new laws still can't effectively be relayed to all citizens every time they go into effect people often break laws without knowing it.
For example- If you live in California and you've received one of those annoying "singing" birthday cards you've probably committed the crime of throwing it away, because it's considered E-Waste.
Every year folks in Topeka, Kansas commit the crime of having a snowball fight, and yet the entire state remains at large.
And if you're thinking about selling your stuff on eBay without giving a cut of the proceeds to the IRS you're thinking like a criminal.
See 19 Laws You've Probably Broken Without Realizing It here