Take for example this simple (and I imagine, universal) rule: If you have in your possession a Brassica and you don't have a specific meal planned that involves it, in three weeks time you will be dragging a plastic bag full of cauliflower sludge out of the fridge. This can be formulated using a fairly standard notation as (p & ¬q --> ¬p).
Human brains are brilliant at rearranging such logical formulations and I expect you will quickly notice that (¬p v q) follows and so next time you're browsing the broccoli aisle you can think to yourself: Either don't buy it or make a plan to use it now.
And that is the lesson that I had intended to implement in the coming weeks. Except then I had to buy a sweetheart cabbage today because otherwise my shopping would have consisted of a bottle of wine and a pack of butter and I don't want to be judged by the staff in Lidl. Although, I think they might have judged me because I was the only person who wasn't buying or wearing something with the St George's cross emblazoned on it.