Do you never finish a bunch of bananas before one or two are too brown for your taste? Slow down the ripening process by wrapping a piece of plastic cling wrap around the crown of the banana bunch.
Educational weblog SnapGuide points out that you should use a piece of cling wrap around the size of your fist and wrap it tightly around the crown. Each time you remove a banana carefully remove and replace the cling wrap. If done correctly this trick should give you another three to fives days before your bananas are too ripe to enjoy.