How about some of these:

-a group of people grow up to be life-long friends
-superheros
-Canadian guys saying "eh" at the end of a sentence
-Brown guys driving taxis
-Chinese guys owning restaurants
-Italian guys in the mafia
-Russian guys drinking vodka
(I could go on forever with ethnic cliches)
-a protagonist who has a legit job by day, and fights crime by night
-happy endings in movies