Hi. I too have lasered a banana. I did it just to try it out for fun and lasered on it the words 'Allergy Advice: Contains banana'. I showed my Dad and he asked if he could have it and try an convince a friend that he bought it in a supermarket like that and that it is a new thing supermarkets are doing, health and safety gone mad sort of thing!
I have also lasered a biscuit and a leaf. I'd love to try toast one day