The inability to idiot-proof your life

Irritating as other people are occasionally, nothing beats my own incompetence for driving me crazy.

One thing I hate is having to shake out my laundry because I forgot to empty my pockets of paper, tissues or small bits of cardboard before putting the load on.

I hate that moment a lot more when I realise that the cardboard mess was my two-day-old weekly rail pass ...

What's the dumbest thing you've put through a wash cycle?