Just to chime in on southern things that are missed when you go north - Whataburger! Best hamburgers and sorely missed when out of town.
My son said in a facebook post - you know you're from Texas when every other status update is how excited people are that HEB is going to carry Whataburger Ketchup and Mustard.
We are extremely loyal to that brand (and I agree that Shipley's donuts are great!).
Another thing we love down here are kolaches - the kind made with good German sweet dough. My son can't get them in Florida and thinks he should open a shop!
Also, a good friend of mine from South Carolina says - You'ens instead of y'all. Is that common?
And fixin to is part of any conversation