The photo, posted Wednesday on the content-sharing site Reddit, came with this note from a customer: "I was going to buy a Frosty from Wendy's until I saw the employee do this."
The photo isn't funny to us," a spokesman for Wendy's told ABC News.
The sharing of the photo could not have come at a less opportune time for the fast-food chain. The company is currently promoting its Frosty products, including its newest Frosty Waffle Cone, for a Father's Day charity drive for the Dave Thomas Foundation for Adoption, named after Wendy's founder.
Here's more from Wendy's about the photo, and seven other examples of fast-food mayhem that made the rounds on the Internet.