Good one, too!
I spent a lot of time in Louisiana as well, so while not strictly Texas only, here's a couple of extra credit items:
1. While most here can probably pronounce Nacogdoches (Texas) correctly, how do you pronounce Natchitoches (Louisiana)?
2. What is the difference between a "jackass" and a "coonass"?
What I call a "jackass" and a "coonass" are probably offensive to some people. The first is every 0 bummer voter and the second is trailer park trash.