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Why would you want overripened bananas? One, they're sweeter, and two, very ripe bananas make the best banana bread! If you want to ripen your bananas in a hurry, there are a couple ways to do so.
1.) Put them in a brown paper bag for a couple days. To speed the process, add an apple to the bag.
2.)Use the microwave. Pierce the skin of the banana in a few spots, then heat on high for 1-2 minutes with the skin on.
Also, if you find yourself with too many bananas, put them in the freezer, skin and all. To thaw them out, just leave them on the counter at room temperature.
Started having issues in '92; lived with it until October '05 when I had a constant low grade fever for 3 months. CT scan showed Ulcerative Colitis. Capsule Endoscopy, Colonoscopy and upper GI November '05 gave diagnosis of Crohn's and GERD. I have ulcers from my mouth to my bottom and have had fissures/fistulas. Tried Prednisone, Azasan, Asacol and others with no improvement. Started Remicade infusions February 2006. Doing better but still don't feel 100%.