State of Confusion

My shirt says "Don't Mess with Texas."  I don't even know what that means.  It doesn't make sense, because how would you mess with a whole state?  I guess you could say something bad about a state, but then who's going to do anything about it.  I'm sure the state has more important things to do than to worry about if I "mess" with it.

Instead of worrying about whether you're messing with a whole state, I suggest you that you "Don't Mess with Calvin."