PITTSBURGH (KDKA) – It might seem like second nature in Pittsburgh, but in Chicago people say you’re never supposed to put ketchup on a hot dog.

So, in honor of National Hot Dog Day, Pittsburgh-based Kraft Heinz decided to have some fun in the Windy City.

It created a Chicago Dog Sauce and convinced hot dog lovers to try it.

Little did these die-hard hot dog lovers realize that the special sauce was just ketchup.

The reactions are priceless and generally positive!

Join The Conversation On The KDKA Facebook Page
Stay Up To Date, Follow KDKA On Twitter

More From CBS Pittsburgh

Get The All New CBS Local App
KDKA Weather App
CBS All Access

Watch & Listen LIVE