Calculators! Cigarette lighters! Why has no-one ever combined the two? Oh, wait: THEY HAVE (https://shadycharacters.co.uk/2023/08/ql-10/). Rounding out my series on Calculators of the Day, I give you the Casio QL-10 Calculighter.

(CC BY-SA 2.0 image courtesy of Vicente Zorilla Palau.)