We've all done it.
Sometimes, when you're in the supermarket, the compulsion grabs you to make a last-minute swap. An impulsive, split-second switcheroo. You're going to put the Maltesers down and grab some Tipp-Ex. Ditch the cling film for some gammon. Jettison that copy of the Guardian in favour of eight cans of Kronenbourg. It might look like a strange decision to anyone else, but you know your thought process.
And so do we.