When Jennifer Knowles helped her sons set up their first lemonade stand over the weekend, she thought it would be a lesson in entrepreneurship and charity.
"The boys went online and they decided they wanted to help a child in another country less fortunate, and we found a place in Colorado Springs called Charity International, and they picked a five-year-old boy in Indonesia," she said.
But they got an unexpected lesson too.
"Someone complained about our lemonade stand," said Knowles.
Turns out, you need a permit to operate a lemonade stand in Denver similar to hot dog, peanut and sunflower seed vendors outside Coors Field.
The city says it's about health and safety, but in the Knowles' case, competition may also be in play.