@willelm@jiujensu@skyekilaen@bookstodon@lgbtqbookstodon I don't remember a point in that particular story where anyone actually gets hurt, but the angry AI 1+2=7 robot definitely angrily chases Trurl and Klapaucius down and threatens to flatten them for disagreeing.
By that age I found this HILARIOUS. YMMV.
Some of Lem's other books I would absolutely hold off on until they're older (13-16ish). Memoirs Found in a Bathtub, The Futurological Congress, very dark and bleak (but amazing).