Hi TAS:
I would like to dispute your use of the phrase, "Hey, watch this!" Though the caution you suggest is well noted and worth the effort. That phrase is very well known and often used by Air Force pilots and Aircraft Commanders.
Academy graduates and Alums of many, many fine northern colleges as well. Often noted somewhere in an aircraft's crew transmissions directly before an In Flight Accident or Emergency.
Your attenion to slow driving Southerners is dead on the money. And may even be seen in some parts of Southern and Central Maryland.
If I had a nickle for every time I heard "You ain't from around here, are you?" during my nearly four years stationed at Little Rock AFB, Arkansas; I'd be a millionaire today!
Jack.
I generally try to avoid travel above the Mason Dixon line.
They seem to think I speak a foreign language.
I always heard it as, "Hold my beer and watch this!"