"Something to think about the next time you eat at the salad bar," the original poster wrote.
The heinous act has now been viewed more than a million times and freaked out social media users have dubbed it "the grossest thing of all time".
"Can this man be identified and publicly noticed and barred from all restaurants?" asked one commenter on Twitter. "This needs to be immediate."
"Just crossed soup off my shopping list," added another.
Although many were grossed out about the man's lack of "hot food bar etiquette", the original uploader did state that they reported the man to security afterwards.