Irresistible Frosty Machine
The photo shows a male Wendy's employee on his knees eating directly from the Frosty machine.
The angle of the photographer seems to indicate the Wendy's image was captured by a fellow employee behind the counter, which Reddit users pointed out.
A Wendy's spokesman said the incident involves a single Wendy's franchise restaurant.
"The photo isn't funny to us. The incident was totally inappropriate, and we're taking it very seriously. We've contacted the franchisee who is taking swift action," the spokesman said, declining to comment on the location of the franchise.
The company appears to be continuing its Father's Day charity promotion on Saturday and Sunday at participating restaurants. Wendy's will donate 50 cents from the sale of every Frosty product to support efforts to match foster children with prospective adoptive parents.
Wendy's says it is the third-largest fast food hamburger company. It has more than 6,500 franchise and company restaurants in the U.S., its territories and 27 countries.