The MI/WI/MN accent always gets a lot of teasing on TV, especially since Sarah Palin speaks with a slight upper midwest tinge. "You betcha."
Since I grew up with it and our semi-Canadian dialect, I never realized it until I went to Virginia/DC area when I was a teenager. Someone said to me, "I could tell you're from the north by your accent."
Also, when I asked how much pop was at a small cafe, they said, "We don't have popcorn."
When I finally did get some pop (ginger ale) I asked if it was Vernors. The waitress looked very confused.
Next summer when I went out to Colorado and the Southwest, I had LOTS of fun asking for pop, Faygo, Blue Moon ice cream, Detroit style pizza, Saunders ice cream and if the stores mind if I paid with Canadian coins.
Southern accents don't really bug me since DH's family lives in Georgia and I have some family in Arkansas and Kentucky, but I do find it amusing that many of their friends think we're Canadian.