Jack in the Box surprise
Back in the day, Jack in the Box employees would sneak a free toy or balloon into your meal if they felt like it. They even had stupid characters like the Onion Ring Thing and the Hambugermeister.
I got a free balloon once. The guy was high and probably still is.
My kid got the Secret Sauce Agent. It was just a tiny cup and a sticker. Worth it.
They had a coupon for the Small Fry. I used it. Then I cried.