*he/she says something* (maybe significant, maybe not but tomar gaaye lagse ebong tumi ekhon taare dhorba)
you:
Tumi OITA bolla ken?? 
he/she:
Ki bolsi? 
you:
Ki bolsi maane?? Ei je ei matro bolla! BOlo keno bolla??! 
he/she:
Areh ajob!! Ki je kokhon bollam?? Ki bolsi bap??!
you:
Haa ekhon to shadhu shajbai! "Ki bolsi/kokhon bolsi!" As if kicchu jano nah!!
Bolo keno bolla oi kotha ta??? Bolar ki karon?? *eibhabe kichukhon cholar pore he/she goes insane, gives up and apologizes. The result? You win*