If you have a rock-hard avocado, put it in a brown paper bag on the counter; it'll be good to go in 2 to 5 days.

If a wrist counter is embarrassing, then make a small tear in a piece of paper in your pocket each time you say "you know".

In the paper, the scientists nicely rebut a variety of counter-explanations, such as that the subjects were too polite or intimidated to say that their choices had been switched.