1)One Bengali is a poet
Two Bengalis is a film society
Three Bengalis is a political party
Four Bengalis is two political parties

2)One Punjabi is a 100 kg hulk named Pinky
Two Punjabis is a Pinky with his brother Twinky
Three Punjabis is an assault on the McAloo Tikkis at the local McDonalds
Four Punjabis is a combined IQ equal to one

3)One Bihari is Laloo Prasad Yadav
Two Biharis is a booth-capturing squad
Three Biharis is a caste killing
Four Biharis is the entire literate population of Patna

4)One Mallu is a coconut stall
Two Mallus is a boat race
Three Mallus is a Gulf job racket
Four Mallus is an oil slick

5)One UP bhaiyya is a milkman
Two UP bhaiyyas is a halwai shop
Three UP bhaiyyas is a fist-fight in the UP Assembly
Four UP bhaiyyas is a mosque-destruction squad

6)One Gujju is a share-broker in a Bombay train
Two Gujjus is a rummy game in a Bombay train
Three Gujjus is Bombay's noisiest restaurant
Four Gujjus is a stock market scam

7)One Andhraite is a chilli farmer
Two Andhraites is a software company in New Jersey
Three Andhraites is a Naxalite outfit
Four Andhraites is a song-and-dance number in a Telugu movie

8)One Kashmiri is a carpet salesman
Two Kashmiris is a carpet factory
Three Kashmiris is a terrorist outfit
Four Kashmiris is a shoot-at-sight order

9)One Tam-Brahm is a priest at the Vardarajaperumal temple
Two Tam-Brahms is a maths tuition class
Three Tam-Brahms is a queue outside the U.S consulate at 4 a.m.
Four Tam-Brahms is a Thyagaraja music festival in Santa Clara

10)One Bombayite is a footpath vada-pav stall
Two Bombayites is a film studio
Three Bombayites is a slum
Four Bombayites is the number of people standing on your foot in the train at rush hour

11)One Sindhi is a currency racket
Two Sindhis is a papad factory
Three Sindhis is a duplicate goods shop in Ulhasnagar
Four Sindhis is the Hong Kong Retail Traders Association

12) One Marwari is the neighbourhood adulterer
Two Marwaris own 50% of Calcutta
Three Marwaris can finish off all Gujaratis & Sindhis
Four Marwaris will threaten the Jews as a community

13)One U.S. Desi is a software guy
Two U.S. Desis is a lunch group at work
Three U.S. Desis is a bitching session about the U.S
Four U.S. Desis is four software guys, heating tamarind rice in the office

14) One Manipuri is a very quite guy going about his/her work in a non-Manipuri town
Two Manipuris is a 'one too many' in a non-Manipuri town
Three Manipuri is a weekend dinner party with bitching sessions about everything else
Four Manipuris is a association with strong ema-leibak feelings who wants to do something for the land but cannot due to his/her distance from the place.