Bananas leave peels when eaten. Bananas can also be broken, though this doesn't affect their edibility. A special variant of the banana is the Golden Banana, which is only worth more, and nothing else. There is also The Holy Banana of Oily Orpiv.
Bananas can be 'z'apped, producing little more than a message reading "BANG!". Bananas always have 6 charges, however, each time you zap a banana it is put at risk of being jammed, which will prevent further zappings.
Broken bananas cannot be zapped.