Okay, I know the title is a little ridiculous, but I swear I am not making this up. When I was a kid, my parents bought a lot of rice and a lot of bananas (among other things). They would get the big 25# sacks of rice, which seem to be made of several layers of kraft paper, and put them in a cabinet.
When they bought bananas that were a little too green to eat, they would put whole bunches into the rice sack for a day or two. Does that actually make any difference for ripening? If so, is it because of the rice? The paper bag? The cool, dry, dark environment in the cabinet? Something else entirely?
This question looks related, but I don't know if the extra conditions I've noted make a difference beyond what was noted in the answer there: Why does a brown paper bag speed ripening?