I got this recipe from a lady at work named Shirley. It seriously makes the best caramel corn/popcorn balls. Enjoy!
3/4 c sugar
3/4 c brown sugar
1/2 c light corn syrup
1/2 c water
1 tsp white vinegar
1/4 tsp salt
3/4 c butter
Combine all ingredients except butter in medium saucepan.
Heat to boiling over medium heat, stirring constantly.
Cook to 260 degrees on candy thermometer, or until a small drop in cold water forms a hard ball.
Reduce heat, add butter and stir until melted.
Pour sauce over 3 bags of popped popcorn, Shirley uses Orville Redenbauchers Movie Time Popcorn.
Stir and serve, or form into balls.