You can't make this stuff up. This actually happened to my mom at a popular fast food chain, the one often associated with a clown dressed in red and yellow:
Mom: "I'd like the senior coffee, please, and can I just get it in my commuter mug?"
Red & Yellow: "Oh, I'm sorry, your mug is bigger than the senior coffee, so we have to give it to you in the regular cup."
The girl brings Mom a cup of coffee. Mom pays her whopping total of 45 cents, and pours the coffee into her commuter mug.
Mom: "Do you guys have free refills?"
R & Y: "Yeah"
Mom: "Great! Can I have a refill?"
And that, my friends, is when the light bulb came on at the Red & Yellow.