In Italian, like in Spanish, the same word is used for both because and why. This word is perche (pronounced pear-KAY).
A sweet Italian sister was taking advantage of being surrounded by anglophones to practice her English.
On a particularly frustrating day, she dramatically raised her arms to the sky, shaking them, and yelled out, "BECAUSE!?!?"
Her patient companion corrected her: "It's why, sister. Why."
The Italian sister raised her arms to the sky again, correcting herself: "WHY!?!?"