Tri rajčice, molim vas means “Three tomatoes, please”.
At the tomato stall you announce a trick to the seller: how to take three tomatoes off his table elegantly. The trick (Trick in German) gives you tri. Then a heron arrives, sent by Genghis Khan, and takes the tomatoes away with its toes – heron (Reiher in German), Khan and toes give you rajčice. Afterwards it flies off to the limousine: molim vas.
The number three is now anchored twice: as a number on the body list and as the trick in this story.