Waiter, Scarper!
Vrchní, prchni! (original)
It is the story of a man who had financial troubles. He was married several times and had to pay for several kids. He wanted to earn some extra money by playing in a cafe. But one drunken guest supposes he is a waiter and pays his bill to him. So the main hero finds his chance - he goes through restaurants, pretending that he is a waiter and asks people to hand their cash to him...
Starring Josef Abrhám, Libuše Šafránková, Zdeněk Svěrák, Dagmar Patrasová, Zuzana Fišerová, Eliška Balzerová, Karel Augusta, Jiří Kodet, Daniela Bakerová, Renata Mašková
Watch "Waiter, Scarper!" on Amazon released in 1981. It's a comedy movie, and has a rating of 7.9 out of 10 from Imdb which is usually fine for this kind of movie, and is currently only available for purchase or rent.