The easiest tried and tested way of knowing if you are a FOB or ABCD is .... peanut butter.
FOBs hate peanut butter, no matter how long they have lived in America!
No FOB can ever grow to like it, or appreciate it. They think it's just weird.
Test this with any FOB that you know -- and you will see how accurate this litmus test is.
Umm I am an ABCD but i HATE peanut butter!!!
......test failed. How about using "Sushi" as a test.
Or even better yet, ask them to pronounce the word "Schedule"...
if they pronounce it "Skedjjewllll"...then almost a proper ABCD...BUT
if he/she says "Shedeooule"......then its a FOB alert
Sorry if i offended anyone :)