Hey, that's why I asked - to learn how others see Russian culture from the outside. What's the defining quality.

?

The first joke - thoughtful irony (the plumber prides himself in being covered in shit - but is it worth it?). The second is very uniquely Russian (I only kind of get it) - somehow, vulgarity with a good comeback is funny. The third makes fun of overvaluing superficial social status (being in the aeroplane industry), which I could see as an internal stereotype of Jewish culture.

Explicitness

fatalism

Do you mean "fatalism" (a general acceptance of fate) or "defeatism" (a certain pessimistic variant of that acceptance) ?

More of the first. Some of the second. But the latter with a sort of sly smile.