For the last couple of days, my backpack has made a regular 'thunk' type rattling noise whenever I've walked anywhere. I couldn't work out what it was, and it was starting to get slightly annoying.

I found the cause when I noticed the small plastic tub of digestive biscuits which I'd put in my bag on monday, with the intention of having them during my coffee break. They had turned into a collection of irregularly shaped digestive fragments.

It's not been a good week for forgetting about food.