What is considered a crime in Canada but not in the U.S?

 My vote for the most common thing in the good old USA that would be illegal in The Great White North would be this:

In Canada concealed carry of a firearm does not exist unless you are a criminal. In Canada, we do not permit the concealed or open carry of a handgun by anyone other than police or security persons. 

There is a provision in the act for special circumstances, but I have never heard of anyone overcoming the bureaucratic hurdles.