Żart przy wymianie koła i podnoszeniu taczek

What does “co dwie głowy, to nie jedna” mean in Polish?

Co dwie głowy, to nie jedna is the Polish “two heads are better than one.” The shape is a proverb pattern you’ll meet again — co X, to nie Y, “X is a different thing from Y” — and the sketch plays on it: one man says it after the two of them manage to lift a wheelbarrow, and the other looks at their scalps and answers obydwie łyse — “both bald.”

The vocabulary around it is workshop Polish: koło wymienione (“wheel changed,” using the short participle Poles love for done jobs), nie mam siły (“I haven’t got the strength”), podnieś je sama (“lift it yourself”). One grammar curiosity: taczki (“wheelbarrow”) is plural even for a single one, like drzwi (“door”) and spodnie (“trousers”) — which is why the sentence says podnieść je, “lift them,” about one barrow.