Redneckhunter recounts the story well. A small coffee shop in Princeton, NJ, Small World Coffee, gets its start selling muffins made by a lady in town. They are amazing muffins. The proportion of blueberry and muffin is mindblowing. How does the muffin stay together?
The coffee place gets more well known for their coffee, and the lady decides to stop making the muffins full time. Now, these legendary blueberry muffins are only made on weekends. One tray only, and they are usually sold out by noon. Redneckhunter attributes this largely to some "regular" who sweeps in and buys half the tray each morning.