This usually works on people of Pakistani origin due to the historical hostility between the two nations. Probably works the other way around as well.
Farhan: Hahh .. another birthday? How old is he? Around 40 now?
Jess: Eeewww he's not! That would make him 17 years older than me!
Jess: Stop being an indian.
Farhan: Ooooohh .. INDIAN THRESHOLD CROSSED!!