Doubling Earth's gravity for a second would effectively turn every living organism into a pancake. The normal acceleration due to gravity is 9.8 m/s², so cranking it up to 120.37 m/s² would increase your effective weight by over 12 times. Your bones would shatter, buildings would collapse, and the atmosphere would compress dramatically. The genie's confusion is completely warranted—he's basically being asked to temporarily exterminate all complex life on Earth by someone who clearly failed high school physics but somehow memorized random numerical values. The second wish would probably be for a time machine to undo the first wish, but good luck articulating that when you're a puddle of organic matter.