A doctor's office in Michigan, USA, left fast food uncovered for two years and watched as it refused to rot.
Staff at Vaughn Chiropractic purchased the McDonald's cheeseburger and fries two years ago, along with a chicken soft taco from Taco Bell. The intention was to show patients what they were putting in their bodies.
Practice owner Dr Jacqueline Vaughn told The Daily Mail: "There's no smell from it, it's basically mummified. You can pick it up, turn it over and still see the cheese and pickle in the burger and the lettuce and cheese in the Taco Bell.
"Even in the summer when we get ants, the bugs won't go near it."
Assistant professor of food science at Wayne State University Yafan Zhang told CBS Detroit the fast food was kept looking fresh by calcium probinate.
Doctor Vaughn said she plans to keep the food on display "forever".
This isn't the first time fast food has stayed intact for the long haul.
A man from Utah is the proud owner of 'fast food's oldest McDonald's cheeseburger', which he has safeguarded since 1999. Worryingly, despite being almost 15 years old, the burger looks "almost new".
Last year, to combat speculation about their use of preservatives, McDonald's released a video to prove that their food does actually rot. We're pretty sure this is the first time a company as had to boast about their produce rotting, but hey - there's a first time for everything.