How to remember if you did something

A simple way to remember if you locked your car, turned the gas off, watered the plants or whatever, is to do something unusual around the time that you do it. When you find yourself thinking back to whether you did it or not, you will know for sure when you remember the strange thing that you did that is connected to it. The only limit is your imagination.

Ironically, I can’t remember where I learned this — I must not have followed this tip.