By placing a familiar object in an unfamiliar context, you can intentionally trigger the recall of a memory when that out-of-place object is seen again.
Use a beanbag when you think of something you have to do in the future, and then throw the beanbag across the room where you will stumble across it later. When you see the beanbag out of place, you will remember the thing that you have to do. Another example of the technique is thinking of something you have to do the next day while laying in bed about to fall asleep. You could throw a pen across the room, and when you saw the pen in the morning out of place it would remind you of that task when you woke up next morning.