For all the office workers maddened by their sandwiches being pilfered from the fridge - or for students in shared accommodation - comes this nifty bag, which gives the sarnie the appearance of being covered in mould. Another possible benefit for retailers could be selling out-of-date mouldy sarnies - the fake mould acting as a crafty disguise for the real mould underneath (but of course, we wouldn’t recommend that, Mr Trading Standards Officer).