For me it’s gotta be “Morte e Vida Severina”/ “Severino Death and Life”. It’s an epic poem narrating the journey of a poor man from Northeastern Brazil, a famously poor and segregated region that’s frequently affected by severe droughts, fleeing from his home and walking to the big city to survive the season. On the way he describes all the misery he experiences and sees.
One stanza that has stuck with me for years goes something like this "And all of us Severinos/With the same lives/Will die of the same/Severe Severino death,/The death died of/Old age before thirty/Of an ambush before twenty/And of hunger day by day/(Of weakness and plague/The Severino death/attacks at all ages/even those not born)
Gombrowicz is great. I’ve read only Cosmos so far, but definitely want to read Ferdydurke and a couple of his other books, possibly his diary too.
I live in Australia, and in my city there is actually a bar called Ferdydurke with decor inspired by the book!