Why the cup?


A few days ago, our family splurged and enjoyed a MacDonalds lunch. As usual, we all got water. For us, the big reason is saving $5 or more.

This was the first time I had seen cups specifically for water. Possible reasons for this are:

  1. To keep the customers honest. If another customer saw someone filling their water cup with soda, the fraudulent filler might feel guilty.
  2. To make the water drinker feel self‐righteous. They might want to brag that they are drinking a healthier drink than others.

Do you have any additional ideas why they may have done this?