"Ping-pong" sounds like a cousin of "sing-song," like something Eastern, but actually, it's believed that it was invented by high-class Brits during Victorian times, who started hitting wine corks over walls of books after dinner.
"Ping-pong" zvuči kao srodnik "sing-song" (pjevušiti), kao nešto istočno, ali zapravo, vjeruje se da su ga izumili Britanci viših klasa u viktorijanskom dobu, koji se se počeli gađati vinskim čepovima preko zidova knjiga nakon večere.