There is an alternative method that can be deployed to remove the casing (aka Skin) from a banana...
- Grip the banana so that the end formerly attached to the tree is facing downwards and the blunt end is upper-most.
- You'll note that the bend has a squarish profile. Using the thumb and forfinger of each hand, grip the end of the banana so that each digit is on one of the 'faces' of the square.
- Simply squeeze slightly and pull apart to remove the, err, casing.