Place: Public Place. Could be an icecream parlour or park or bus.
Character 1: Talking on phone in One language, say Tamil.
Character 2 happens sit near in the vicinity of Character 1.
Character 1 gets jumpy, feels intrusion of privacy, switches over to some other language, say telugu.
All of a sudden, Character 2, gets a phone call, picks up and starts speaking in Telugu.
Expression on the face of Character 1: Priceless.