Here are some fun facts between Korea and America.
Dial Emergency: 911 (USA), 119 (Korea)
Dial Information: 411 (USA), 114 (Korea)
Waving goodbye: Wave hand side to side (USA), rotate hand left right (Korea).
Open up a banana: From the stem (USA), from the tip (Korea)
Apple on a plate: Stem up (USA), stem down (Korea).
Traffic lights: Verticle (USA), Horizontal (Korea)
Police lights flashing: Emergency (USA), Standard operation (Korea)
Meals: One large plate (USA), many small dishes (Korea)
Asked are you hungry: Yes means yes (USA), No means yes (Korea).
Asked if you are full: Yes means yes (USA), Yes means no (Korea).
And finally I think we have found the key reason for these seemingly opposite behaviors:
Location: One side of the planet (USA), the other side of the planet (Korea)