Deaths from falling out of bed in the US

Japan's population has been declining since roughly 2008, and American deaths from falling out of bed have been rising — a negative correlation of -0.9718 that, if taken literally, suggests Japan could save American lives simply by having more babies.

Japan's total population has been declining due to one of the world's lowest birth rates. U.S. bed-fall deaths have risen due to the demographic aging of the Baby Boomer generation. The negative correlation is coincidental.

Demography produces the tidiest spurious correlations because populations move slowly and predictably — you can always find one going up while another goes down.