I'm not sure if you subscribe to the Yelp newsletter in your area, but it has been really invaluable for me to learn about what goes on in my area. They usually have a section that recaps the weekend events, and more importantly a roundup of some type of food or activity in the area (acai bowls, local hikes, pho).
Some time ago they had a roundup of donuts, so a bunch of the suggestions went on the list. As if I hadn't had enough donuts this week.
Now, I was headed to the supermarket after the gym with a friend of mine, and I noticed a few of the donut stops were on the way there. Awesome! There's nothing worse than going to a supermarket hungry. For two of the shops, it was recommended to try the blueberry donut and there was even a crosstown rivalry between them on Yelp. Well, a 0.8 mile rivalry because they're around the corner from each other. When I checked on the third, people also recommended the blueberry donut and the idea for an experiment was born!
Buy and eat donuts, duh!