I have read that the Etruscans started the gladitorial “games”.
The Etruscans had an obstruse custom of having a death struggle of sorts as the big funerary sendoff. One bit of art that survives shows a man with a bag tied over his head (iow, he couldn’t see) trying to defend himself from a couple of attacking dogs. The Romans were under Etruscan rule for centuries and picked up some customs, and as Condor51 said, some of the Etruscans’ civil engineering.
The Romans referred pejoratively to their predecessors as obesus etruscus, or “fat etruscans”; the Etruscans had built a wealthy, peaceful (by ancient standards) society, and that’s something else the Romans emulated during the republican period and beyond. The funerary customs of the Etruscans (including cremation) were adopted, but the Roman games which grew out of the human sacrifices of the Etruscans took on an entirely different look.
The Etruscans may have picked up their ideal dining habits (reclining on couches while being served food) from the Greeks, although it may have been the other way around. For their part, the Greeks found offensive the Etruscans’ habit of husbands and wives sharing the same couch.