A woman on a bus in China has been caught on camera eating a mysterious substance rubbed off her ankle.

The woman, who is oblivious to the fact that she is in a public place (or indeed that this is strange thing do) is captured on film reaching down into the side of her shoe, pulling something out and putting it in her mouth – over and over again.

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All the while, her nose buried in her book, she is oblivious to the presumably disgusted passengers she is sitting next to.

Sneezing on the bus is one thing, failing to cover your mouth when you cough is also unpleasant, but eating dirt off the bottom of your foot is a whole other story. Luckily, though, we don’t think it’s going to catch on.

Image credit: YouTube