For the last 5 days, excluding the weekend, I have been putting an orange in my son’s lunch box: each night, when I wash it, I find the orange still sat there. I wash the lunch box and put it back in, only to find it comes home again the same night. And so on. How long might this game go on? I’m tempted to just keep putting it in, until it goes green and moldy. It’s already looking a bit the worse for wear: shrivelled in fact. It’s a battle of wills: who will crack first and put the orange in the compost? I already know it will be me.