McDonalds, the largest fast food chain serving 119 countries across 35,000 outlets worldwide recently recalled millions of chicken nuggets because of an unusual ingredient found on it.

So what caused the chicken nuggets to be recalled? Continue reading to find out what the mysterious ingredient is..

Japans McDonalds operator continues to have issues with its side menu offerings. In McDonald’s in Northern Aomori, a spokesman said a piece of vinyl (plastic) was found in chicken nuggets sold over the weekend. And as a result of this discovery, the fast food chain stopped sales of nuggets that were produced at a Thai plant on the same day that the nugget was made. The spokesman said. He added that the contaminated nugget is currently being transported to the company’s headquarters in Tokyo for further investigation according to the wall Street Journal.

This is not the first time McDonald’s have had problems with their menu items. In fact, there were several reports claiming that a dead mouse was found in their coffee and a dental material and human tooth found in McDonalds Canada. These type of reports dramatically caused a tremendous decrease in their sales and the brand has increasingly become damaged because of all these reports.

Furthermore, last summer, Shanghai Husi Food Co. was accused of repacking expired meat for fast food restaurants in China. McDonalds was among the fast food chains hit hard by this news. Executives of the U.S. owned meat supplier were arrested when learning of this discovery.

No beef or chicken products are being sold currently at a McDonalds in Beijing. The reason behind is the processing food scandal in China where workers at Shanghai Husi were caught on television using expired meat and they were also found picking it up off the floor and returning it to the factory line. This led to McDonalds and many other restaurant chains to cut ties with their supplier. Check out the video below for more info on where’s the beef in China?