I now have my own office but when I worked in an open plan design office, this sort of behaviour was quite infuriating. Not just apples and crisps of course.... what really got to me was the technician who was on a raw carrot and apple diet.... slice, slice, slice, munch, munch, munch every lunchtime. Then he would pile all the peelings into a plastic bag, tie it up and throw it into the bin. I kept trying to convince him to take it home and put the stuff in his compost bin but nope, he refused to have one of them in case - wait for it - it attracted mice and rats who were NOISY eaters..... He never did understand why I giggled every time he got his carrots out....